agreed, I get kinda twitchy if I haven't had much/reasonable update and the PP-date is about to expire. Offcourse if it's big piece, even more with tradiotional art - I'm happy with a line or two maybe every/every second week - just to stay in the loop.

Personally I try get stuff done within 2weeks to a month - but I only work one day of the week and have only had 1 comission at the time