Sorry to hear about your problem, 5 days is a resonable time if they have to fit engine, steering, backrests, hatches, ss parts, cushions, electronics and all other small parts.
When you start to fit the boat its more parts than you think and plenty off cutting so all hatches etc fits, plenty of drilling for grabhandles, backrests, hinges for all lockers, fit cushions on the backrests.
Aftere that everything has to be screwed also.
The engine has plenty of meters of cables that has to be drawn in the under deck wiring, batteries, oiltanks has to be fitted in deck, engine has to be meassured in and be fitted on transom.
U-bolts and D-rings has to be fitted in bow and transom, the lifelines has to be fitted (the ropes)
Windscreen has to be drilled and fitted.
The fillers and pipes for the tank needs to be drilled and fitted in console.
All cables for the gps and VHF and the machine has to be fitted (even the antennas)
Fit the elephant trunk
The list can be long, it doesnt looks like much work when you se the boat but there is a lot to do so 5 days is resonable BUT there is 24 hours per day