i wanna get my stock rims painted black?

how long does a power coating place usually take to do this?
and how much?

 

depends on the shop... there's a place in So Cal that I use (and a few others have) that takes 2-3 days and is $40-$60 per wheels (depending on color)...

FWIW, the reason I even sought this shop out was becasue every other place took a week or more...

 

^ +1, unless they are real busy. I had half dozen pieces for my boat done and it took 4 days.