The one that's melting is container wax. I think I should bring those boxes in the house. We are in the Sacramento area and it's been HOT! A couple days of 107-108 is a couple too many! (The wax is ok, much easier to cut right now!)
With the temps being 100+ for over a week, I happen to notice the reaction the boxes of wax had. They are in the garage and obviously don't care for this 100+ heatwave we are having....
I hold the end of the wick with my finger nail, and squeeze the top of the tab with needle nose. Sometimes they curl up but they are easy to bend back. HTH (Actually when I'm sitting watching tv or relazing, this is what I don't mind doing) Just make sure you squeeze good or the wick will pop out!
I have to agree, there are so many variables. Wax, FO, amt of FO, yada yada. Sorry can't give a definate answer. I usually get a couple-three days out of my tarts. HTH