How long did they wait until it was decided you had a 'retained placenta'?

In homebirth circles, it is really common to hear of women waiting quite a few hours for the placenta to come, no-one panics, and nature takes its course.

I really think hospitals panic far too much about placentas, and if you have a physiological third stage, it's usually just fine to wait it out, as long as there is no abnormal bleeding etc...

My first one took about 1.5 hours, second was faster, but I've heard really amazing stories of them taking many many hours with absolutely no problems, sometimes they just take a while to come.