Last weekend I picked up 12 pints of fresh tart cherries from Nichols Farm & Orchard. It took about 2 hours for my spouse and I to pit them with a metal chopstick while we watched movies. Most are now frozen and ready for smoothies. My only regret is not buying more.
Washed and ready for processing. 
I held each cherry over a plastic pitcher to collect the pits. 
Ready to freeze. 
They taste even better than they look.