It usually goes fairly quickly if you have a pokemon that has magma armor/flame body in your party. it counts each cycle 2 times instead of one, making it twice as fast. Also for entire parties of hatching i ususally go to gear station as you can run around the entire thing in certain "lanes" without bumping into anything so i put macargo in a slot and rest eggs. Then tape the down button and b down. so much less effort for mass hatching.