Thanx, this give me a rough idea if how often.
I see, so you have many cartos "in use" at a time, or at least as many cartos as you might expect to use in a single day.
I try to have one atty (really two now, one for 3.7v and another for 6v) in use at a time, and run it into the ground before breaking out a new one. So I have in mind to do the same with cartos, use the same one until it's dead.
So... if you were a topper-offer instead of a multi-carto-carrier... sounds like you'd end up topping off 2 to 4 times
So far, I haven't needed to top it off, but I'm mildly worried about burning it and thinking maybe i should drop a couple more in. That's always somewhere in mind when i use cartos.... ah... just dropped 7 more in for good measure... nice pick up in flavor/vapor as a result!