Waiting for test results

I've recently had a couple of hospital tests, biopsies taken in a colonoscopy 3 weeks ago and a 24hr urine 5H1AA test 2 weeks ago. I'm still waiting for results. I'm wondering if anyone has any experience of how long the turnaround on these tests are and if or when I should chase the hospital for results. I'm definitely hoping no news is good news at the moment.