Are those layover times correct?

Many a time, I have got off the metro in the evening peak and whilst a bus is already waiting, it can layover for quite a few minutes before pulling off.

In Houghton, I have seen them scoot around via the A690 and Hillside Way, before coming back along Newbottle Street - rather than wait time on Broadway.
It can take a few minutes to do the full loop of Houghton, depending on the time of day. Then there would be loading times. Combined, it would take over 3mins.

Obviously this isn't always the case, but happens quite regularly over the course of the day.