It takes a good while. You may want to watch him like a hawk or tether him to you while he is up and loose. When they are that young, it seems as though they have to go every twenty minutes. If you put him on a feeding schedule as he gets a bit older you can estimate the poop a bit more. The peeing that is a whole other ball of wax.
Also not sure if you have hardwood or carpets but the way you clean up goes a long way. Use either some nature's miracle or a 50/50 mix of white vinegar and water. They can smell the tiniest bit of whatever and will continue to go there.
It really takes time and patience. Raven is now 9 months and she still has accidents. Good luck and god speed.