Simply head to http://spendyourleapsecondhere.com/ - it's a microsite via Last Week Tonight with John Oliver.
Watch each video 60 times. Then multiply those by 60, and then by 24.
That's how you can spend Leap Day. Or as John Oliver explains during the "leap second" brouhaha:
(Although, technically, if you throw that video into the mix, you can spend even more time)