I paid for mine last week, when I made initial enquiries before had my impressions done about a month ago, they quoted me a 3.5-4 week build time after payment is received. I've had another mockup done since I made payment, so have been in contact with them by email a couple of times over the past week.
If I hadn't done that, I probably wouldn't have expected to hear anything from them until they were complete & ready to ship (I don't believe in hassling them every week to ask 'Are they done yet !!!???'), tho if I haven't heard from them again by the end of the 4th week I'll be sending them a gentle enquiry to find out how things are progressing.
Edit - I should add their communication/service/attentiveness has been first class thus far ;-)
Edited by MistahBungle - 5/7/13 at 9:32am