Funny, it's now halved in time: It was two minutes earlier...
It's not going to be a minute though, is it? You've got the time of the phonecall, the time spent doing the paperwork (both for you and for them), time spent doing the actual task, not to mention paying for the knowledge of someone else. Bear in mind this is also a main dealer and not a back street garage and it seems fair enough to me. They have to work to the guidelines they've been given, you can't blame them for that. If I go out and do a job for someone that takes 30 min, I have to charge for two hours labour as that's our minimum call out time/fee.
They are a business, after all.