>>>>My girlfriend and I will be in Amsterdam June 30th. Our flight is scheduled to get in at 1:05PM. We are trying to find flights to London later that evening, I have found some cheap flights on EasyJet that leave at 9:20PM. How much time would that actually leave us to explore Amsterdam a little bit?

I'll bet you are downtown by 230pm, at the latest. Customs is a breeze. There is a large locker complex just outside customs where you can store your bags. The Easyjet counter will open two hours prior to flight time, and will close half an hour prior to flight time. If you leave Amsterdam at 630pm you should have loads of time to pick up the luggage and be in the front of the line for Easyjet seats.