how long does it take for a posted review to clear and show up on the board?

When you submit it says within 72 hours I think.  However mine have taken anywhere from less than 8 hours to a week.

I have had them up in less than 48 hrs, and as long as 4 days.  I think it all depends on how busy the approvers are, i e, how many reviews they have lined up to read.

Swim

yes i just checked it, its my first review posted so i guess itll take a few, just not sure if i put her link up correctly, i think i did

Oddly enough it was my first review that was approved and posted the fastest.