I just got 1.2 and keep them in a tub about 2ftx1ft. I didn't clean the cage for 3 weeks after I got them still smelled fine but the bedding was getting dusty.

And now they've started just going pee in one corner so I just scoop that area out and move all the clean litter in that direction then ad new litter to the clean side. It takes about a week for the litter in the corner to become dust. I use the wood pelleted bedding, my brand has some mineral in it that's suposed to cut odor. All I know is that mice smell bad, reg rats are okay, and in comparison asfs smell like roses!

For the OP just watch your tank and clean when it needs it, when it looks dirty or starts to smell, whichever comes first.
How long will vary widely depending on enclosure size and the type of bedding you use.