A snail starts at the bottom of a well 10 feet deep and crawls 3 feet each day each night however the poor thing slips back 2 feet how long will it take the snail to reach the top of the well?

He would touch the bottom in nine days. It's like he really only moves up a foot a day, but on the ninth day he will move from the eighth foot to the tenth, but if he has to go back again, then it would take him ten days.