We run & walk every Sunday morning at the times below. It pays to arrive 15 minutes early to get a park and get changed. We have great showers so bring a towel for after the run too. In between build-ups the packs generally run for about 1 ½ hours. Don't worry if that sounds a lot more than you're used to or you're worried about holding the pack up - we stop for water every half hour, and traffic lights are always a great place for stragglers (of which there are many!) to catch up.