Personally, I haven't been keeping track of that.
Because I honestly don't care. It's keeping me off cigarettes, so who cares if I have to refil every xx hours/minutes.
Plus every ecig and vaper is different. So my measurement will be different from yours.
A better, more accurate measurement would be how many ML of juice you use in a day.
And after about 2 weeks since my first supply of ejuice, I've gone through about 30 ML.
So roughly 2 ML (perhaps 2.5) per day.
And I actually am enjoying the "work" involved in refilling. Hobby is probably a better word.
I think the work/hobby involved with Ecigs is a major part of why it's working for me.
It keeps my mind and body occupied.
If I had to guess, I'm probably refilling around 10 times a day. With somwhere around 20 good hits per refill. Vaping almost constantly.
And I'm using a Blu/Volcano. YES, Blu with PTB mod.