I was asked if I do qk?  I dont see it in the self help under abbreviation!  anyone know what it means?

Yea Not worth it!  Plus I just called the store he said he worked at, Nope..wrong.. red flag!!!

Most ads I see use QV for quick visit, aka a bj in 15 minutes and that's it.  Would not recommend you do that, it's a common ad on backpage for high volume, low price providers, usually young ones.

legitimate providers don't offer half hours. Plenty legitimate providers offer half hours, but its mongers like this who perpetrate this myth. Because of  this myth, many have stopped advertising half hours, but will offer them to regular clients, or new clients if asked.  It's your business, build it the way you see fit.