2.3 Conversion time

I can't remember (sorry) but on average, about how long does it take for devs to covert their styles and add-ons after a MAJOR xenforo upgrade such as when 2.3 becomes available?

I've been here a long time but I can't remember the time it took for Devs to offer their products following s large change in XF. I'm just trying to plan some purchases of add- ons and a custom style and don't want to waste any money.

I know every dev is different and every add on and style is different in...