It varies retic to retic. Some never do, some usually do...some will grow out some won't. Sorry that there isn't a real answer.
Is it a defensive poop (i.e. aimed at you, smeared on by a thrashing tail, and ground into the fabric of your clothes by a pissed retic) or is just a dump? Sometimes I find that simply letting them explore a bit stimulates their bowels (which I use to my advantage when I can; I'd rather have them crap in the yard).
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We wouldn't have 6 and a half billion people if you had to be beautiful to get laid.
1.3 African House Snakes
3.2 reticulated pythons
1 corn snake
4.3 Florida Kings
2 speckled kings
1.2 ball pythons
1 Argentine boa
1 Texas Rat Snake
1 checkered garter snake