I don't have a mini but my regular size with the AW IMR 18650 will last me around 2~2 1/2 days and I am what you consider a heavy vaper. I vape around 5mls a day.
A full batt will only last me about day - 5-10 ml per day though....I guess "very" heavy vaper I am pretty much a chain vaper when I can be...
M0D #6 Blend, Mom and Pop's Caramel, SS LE LavaTube, Q2V3 Copper!, Indulgence V3,
MV Gripper,ST 510's+PCC,S.I. VOLT (808)+PCC,Carto e-Pipe,eGo,VV eGo,kGo, WiiGo,
BoxM0D,Auto-Box Mod,Rough Stack Maxi, DoD's,LavaTube Black/Silver, LT minis SS/black/red
Under those conditions, my 'guestimate' would be 4-5 hrs maybe? But again, I'm using LR cartos too. Kanger horiz, 1.5 dc, definitely not set up for hv vaping yet!