Well I have the boge 510 LR cartos and I have about 5 that I prefill the night before. The next day, I rotate thru those 5 and may occasionally top one off. I "think" this keeps them from overheating too much.
This "batch" of cartos typically last about 10 or so days.
One may quit before the 10 days , usually chocolate makes it die before it's time.
I don't clean them, I trash them after they quit...
Many clean them, but not worth the effort to me and the new ones do soooo well.