Gads, that totally depends. In general, I've found the UK much more timely with the interview/hiring process. Universities in particular often post the closing date AND interview date in the ad. That said, I applied for a Uni job in late February and only heard back about 2 weeks ago. Long after I'd thought they would have replied. I'd wait about 3 weeks and then follow up. It can't hurt to ring, especially if you're just contacting an HR or personnel office.