What have you been asked to test mate?
I allow an hour per circuit as a rough guide but we all know it can take a lot longer if there's identifying and tracing to be done, or you come across a fault, all I can say is at the 4 circuits an hour that gaffer is saying about those lads must have sore wrists and numb arses if it's a big site. I'd leave him to it if I were you
saying that though I've just been to a site today to quote for some remedial work off the back of an EICR a mob from Sheffield carried out and they managed a full test on 50 circuits (mixture of single phase and 3 phase) spread over 6 DB's and the paperwork in under 4 hours. Half of the observations I was looking at didn't exist and they missed 3 C1's and 5 C2's that I noticed while trying to find the make believe observations