All depends, the more you torch it the more brittle it gets, and will begin to fall apart sooner. I've had wicks that lasted months, and wicks that lasted less than a day. The worst thing that can possibly happen is if it's not oxidized well enough and you start to crank the voltage up, then BAM bright ... short that cuts a hole 6 layers deep into the mesh. Very hard to recover from that.
Quenching will also shorten the life of your wick. I usually roll it up, give it a real good torching to get it a nice and even dull grey, then do a couple juice burns and I'm good to go. If you want even better longevity you can skip the torching completely and just do a bunch of juice burns, but I don't have the patience for that.