I don't see how that would take more than three hours or so.
Oh.
I have repleced hundreds and hundreds of domestic CUs.
The average existing CU would be either a 4 way or 6 way wylex.
It would take me a full 8 hour day to do the CU swap and required testing.
On the masive majority of these jobs the main protective bonding would be either undersized or missing altogether, so that needed to be installed before the job was completed.
It was normal to have an apprentice with me to install the bonding, and carry out any other required remedial work.
Very common faults are open circuit ring final circuits, open circuit CPCs on lighting circuits, neutral to earth insulation resistance faults.
So before we start, you have
16 man hours on site
Consumer unit
MCBs or RCBOs
Meter tails
Main earth
Protective bonding cable
EC14 earth clamps
Fixings
thru crimps
PVC trunking.
I then need to have the following, which needs to be bought and paid for:
A vehicle to get to your house
Fuel for the vehicle
Tax for the vehicle
Insurance for the vehicle
A drive to the wholesalers to get the parts for your job
A drill and drill bits
A circular saw
An extention lead
A 110V transformer
A hand lamp
Gloves, goggles and a dust mask
A whole range of hand tools running into thousands of pounds
Work trousers and overalls
Up to date qualifications
A multi function installation tester
A current calibration certificate for my test kit
The training to safely and competently use my tester
Professional body membership
Annual renewal fees for my professional body membership
Professional indemnity insurance
Public liability insurance
Notification fees to the LABC
Accountant fees
Dust sheets
Vaccuum cleaner
Time to visit your house to see the job
Time sat at home whilst compiling and writing out your quote
Time sat at home whilst completing your certificate
Time sat at home whilst notifing the LABC of your job
Time sat at home whilst writing out your invoice
An envolope and stamp to send your invoice to you.
And at the end of this, I still have to earn a wage and pay my apprentice his wage too.
I expect I've missed some stuff off my list there