That was the right call, customer has probably been watching too many You Tube videos and the type who thinks he can throw you a twenty if it takes less than an hour and bawl you out if it takes longer than the hour.
The police here (gardai) own a lot of rental properties I never liked even pricing a job for them, never met one who turned up in civilian clothes as if their uniform is supposed to get them favorable rates, strange but they all seemed to be able to put their own ideas as to the time the job would take.
You must be comfortable when doing any job, if it takes longer than you thought then you are learning for the next time, having someone stand over you = nightmare stuff.