Have you ever had people complain you take too long?
"The last guy to service it only took 10 minutes, how much longer will you be?"
I had one like this the other week, wasn't a service but an install.
System to Combi conversion, vertical flue, boiler in place of cylinder. I was there from about half nine until five.
As I'm flushing the system towards the end, the woman comes out and says haven't you finished yet? I think you've had long enough, downstairs had there's done in 3 hours! This isn't good enough!
I was speechless.