Study reveals the total cost of the Obama family's vacations

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What It Cost To Send The Obamas On A Holiday Vacation

The first family's Christmas vacation to Hawaii in 2013 may have cost about $8 million. Of that total, at least $316,000 was for the Secret Service.

That's according to documents obtained by the right-leaning watchdog group, Judicial Watch. The Obamas spent 17 days in Hawaii between December 2013 and January 2014.

GALLERY: The president took some time off to hit the greens:

18 PHOTOS
President Obama golfs in Hawaii
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Study reveals the total cost of the Obama family's vacations
US President Barack Obama arrives on the 18th hole of the Mid-Pacific Country Club's golf course December 21, 2015 in Kailua, Hawaii. Obama and the First Family are in Hawaii for vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Secret Service agents and other players linger after US President Barack Obama clipped a ball in on the 18th green of the Mid-Pacific Country Club's golf course December 21, 2015 in Kailua, Hawaii. Obama and the First Family are in Hawaii for vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
US President Barack Obama walks on the 18th green of the Mid-Pacific Country Club's golf course December 21, 2015 in Kailua, Hawaii. Obama and the First Family are in Hawaii for vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
A motorcade with US President Barack Obama is seen from a bus while traveling to the United States Marine Corps base December 21, 2015 in Kailua, Hawaii. President Obama and the First Family are in Hawaii for a vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
People look on after a motorcade with US President Barack Obama and US First Lady Michelle Obama passed by while traveling to Morimoto's Restaurant for dinner in Honolulu, Hawaii on December 20, 2015. Obama and his family arrived early on December 19 in Hawaii where they will spend the Christmas and New Year holidays. AFP PHOTO / BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
A motorcade with US President Barack Obama and US First Lady Michelle Obama is seen while traveling from Maliki State Forest for a hike December 20, 2015 in Kailua, Hawaii. Obama and the First Family are in Hawaii for vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
US President Barack Obama tips his hat to onlookers after dipping the ball in on the 18th hole of the Mid-Pacific Country Club's golf course December 21, 2015 in Kailua, Hawaii. Obama and the First Family are in Hawaii for vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
US First Lady Michelle Obama is seen in an armored car while leaving Maliki State Forest with US President Barack Obama after a hike December 20, 2015 in Honolulu, Hawaii. Obama and the First Family are in Hawaii for vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
US President Barack Obama celebrates after dipping the ball in on the 18th hole of the Mid-Pacific Country Club's golf course December 21, 2015 in Kailua, Hawaii. Obama and the First Family are in Hawaii for vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
US Milady personnel watch a body of water while a motorcade with US President Barack Obama passes December 22, 2015 in Kailua, Hawaii. President Obama and the First Family are in Hawaii for a vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
A motorcade with US President Barack Obama and US First Lady Michelle Obama leaves their vacation home for a hike along the Koko Head Trail December 22, 2015 in Kailua, Hawaii. President Obama and the First Family are in Hawaii for vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
A motorcade with US President Barack Obama and US First Lady Michelle Obama drives to Koko Head Trail December 22, 2015 in Honolulu, Hawaii. President Obama and the First Family are in Hawaii for a vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
US President Barack Obama (R) speaks with Bobby Titcomb (C) and Darrell Harrington (L) on the 18th hole of the Mid-Pacific Country Club's golf course December 21, 2015 in Kailua, Hawaii. Obama and the First Family are in Hawaii for vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Secret Service, local law enforcement and others watch from a distance as US President Barack Obama and US First Lady Michelle Obama walk the Koko Head Trail December 22, 2015 in Honolulu, Hawaii. President Obama and the First Family are in Hawaii for vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
US President Barack Obama and US First Lady Michelle Obama leave the Koko Head Trail area after a hike December 22, 2015 in Kailua, Hawaii. Obama and the First Family are in Hawaii for vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Darrell Harrington (L), US President Barack Obama (C), and Greg Orme arrive on the 18th hole of the Mid-Pacific Country Club's golf course December 21, 2015 in Kailua, Hawaii. Obama and the First Family are in Hawaii for vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
US President Barack Obama (R) and Darrell Harrington (L) arrive on the 18th hole of the Mid-Pacific Country Club's golf course December 21, 2015 in Kailua, Hawaii. Obama and the First Family are in Hawaii for vacation. AFP PHOTO/BRENDAN SMIALOWSKI / AFP / BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
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But the real cost is from Air Force One. It costs more than $210,000 per hour to operate the plane, and the Hawaii trip took 36.9 hours of flight. That adds up to more than $7.7 million dollars.

It's hard to tell for sure how Obama's vacation compares to the costs of others presidents' vacations. We can compare the amount of time spent on vacations among presidents, though.

As of December 2014, Obama had taken 161 vacation days. At the same point in their second terms George W. Bush had taken 405, Bill Clinton had taken 174 and Ronald Reagan had 390.

GALLERY: President Obama also attracted plenty of attention during a hike:

10 PHOTOS
President Obama hikes in Hawaii
See Gallery
Study reveals the total cost of the Obama family's vacations
Climbing Koko Head Crater with President Obama. It was so exciting meeting him!! #POTUS #Hawaii
When you and your gf meet the President of the United States #POTUS #Hawaii #bucketlist @sandi_jo
Yooo @jerome_baker just gave a shout out to the #marijuanamovement this guy gained a #follower @jerome_baker you the real #mvp for this one!!😂😂😂 #obama #legalize #freetheweed #degenerateart #degeneratehiker #cocohead #cocoheadtrail #barak #potus #highsociety #honolulu #jeromebakerdesigns #jeromebaker #jetlife #wfayo #topshelf #pipedreams #bonghitsforobama #ogtubes #dabsallstars #bhombingamerica
President and first lady hike Koko Crater Railway Trail
Aloha Mr. President!!!
Don't sleep on Barry O. #Intercepted #44 #choomgang #phou79 #KokoHead
Just met President Obama while in Hawaii!!! Wow what an amazing trip!! 🇺🇸
Yooo @jerome_baker just gave a shout out to the #marijuanamovement this guy gained a #follower @jerome_baker you the real #mvp for this one!!😂😂😂 #obama #legalize #freetheweed #degenerateart #degeneratehiker #cocohead #cocoheadtrail #barak #potus #highsociety #honolulu #jeromebakerdesigns #jeromebaker #jetlife #wfayo #topshelf #pipedreams #bonghitsforobama #ogtubes #dabsallstars #bhombingamerica
When you and your gf meet the President of the United States #POTUS #Hawaii #bucketlist @sandi_jo
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