Couple minutes of filling/fiddlin' every day. About 5 minutes every other day to wash and rewick. Maybe once a week, half hour to try some new coil configuration on something.
Actually joked about this the other week while visiting a friend. We stepped out for a smoke/vape break, and as we were walking out, he commented on how he didnt care for the vapes because they took too much work. He then proceeded to pat down all the pockets on his clothes twice, open his car door and look around, and mumble something about "damned lighter..." as he went back inside to rummage. When he came out, I just held up my mod and said "Yeah, so much work...pushing a button, ha! Find a lighter yet?".
Also now that I think of it, I'm positive I spent more time maintaining my Zippo than I do on just basic vape maintenance.
And now that I think of that...how has no one come up with a Zippo-like device to drip juice with? Zippo exterior, U-can style bottle inside. I'd buy 3.