When I facilitate, I have one golden rule. Always give time back, never take it away. I never, ever over-run. Time is such a precious commodity. People have chosen to give this up to take part in your workshop, so you need to treat it with respect. In my view, there’s nothing worse than a facilitator who over-runs. It shows you haven’t planned or you’re losing control of the session. The only time I ever go over the allotted time is when the session owner or the attendees request it.