"ample free time" is correct and usable in written English.
You can use it when you are discussing having enough time for leisure activities. For example, "I am so grateful that I have ample free time to pursue my hobbies."
Perhaps they can fill their ample free time pondering Michigan's loss of luster.
But Bow Wow will now enjoy ample free time to pursue his own hobbies and interests.
Finally, once you pass sixty and prepare to retire, you'll have ample free time to spend with your grandchildren.
In her ample free time, she began reading a form of protest literature known as Misty Poetry.
His post allowed him ample free time; evenings, Zuckerman attempted to teach himself Yiddish and, somewhat more successfully, wrote his first stories for publication, which appeared in The Paris Review, Inquiry, and Esquire.
Like that show's first season this one places a group of young people with ample free time in a house — they knew one another, in this case — and gives them a long leash to misbehave.
There's also ample free family time factored into your week for snowball fights and snowman-building aplenty.
The Internet allows us to be in charge of the input that is circulated through media, providing you with ample opportunities for turning your free time into a useful means for getting out creative, practical, or informative messages that you'd like to share with the world.
If at all possible, ask a family member to care for the child or children the week leading up to the wedding, to give yourself ample space to arrange last minute things and to enjoy some free time to yourself.
There is ample free parking.
Ample free parking on the beach.
