I've been vaping for 7 months or so now, and up until now, I've always had 2, or 3 tops in rotation at once. Right now however, I have SIX going at once.
2 IBTanked Carto Tanks
1 iClear30
1 kanger pro tank
1 evod
1 smoktech aro
Personally, I think this is too much....maybe it is my OCD, but it is now hard for me to decide which one to use each time I go to vape, lol!
I think after I go through a few of these tanks, I'll only refill a few, and keep it down to around 3, 4 TOPS.