I'll honestly sift through the bedding to pick out as many poops as I can find every other day or so. I know I'm not going to get everything but it definitely allows me to go a little longer between full bedding changes.
Stirring up the bedding should increase absorption and allow you to change it less often, if you're using something like wood shavings at least. I clean out the entire bottom pan of my rats' cage about once a month. But now that they have a cage that's multiple times bigger than their old one it'll probably be left for longer. They also have smaller litter pans on the upper floors which get dumped out about twice a week.