I was flying recently in a rented cessna and paying on the hobbs meter. I don't hang around doing my checks as in a cessna single, with a bit of practice, you should be able to do most of the checks in the time it takes to warm up on a cold day. There is something incredibly frustrating about being stuck behind a badly positioned aircraft taking half the day to do its checks! This can amount to £20 -£30 in hire charges for no good reason. If you are going to be overly thourough in your checks please position to minimize frustration and inconvenience/cost to your fellow airfolk!