Bvgs.
I have previously worked for several companies who's policly was to charge a fixed rate for Scheduled Inspections, I seem to recall a 100 Hr Insp on a R22 costing £480 @ £40 per hour = 12 hrs labour.If the job was done in 10 hours then the company gained 2 hrs labour, however if it took 14 hrs then the company lost. It is often a case of "swings and roundabouts"
I have also worked for a company who have no fixed rate charges what so ever, if a job takes 100 man hours then that is exactly what is charged
However in all the companies, the customers complain about the bills being to high
and the management would complain about the cheap labour rates compaired to those charged by car garages.
I also seem to recall that in the Robinson Manual somewhere it states the labour hours required for a 100hr & Annual Inspection.( remember there is no 50 hr Insp on the N reg )