To give you younger folks an idea of the knowledge, time, and labor involved with working on 1A2 equipment here is something to think about. It was very common for it to take most of the morning to install two telephones on an existing system to be connected to existing CO lines. This was not because we were lazy either.

To install two 5 line telephones ( 2564/5 sets ) you had to run two 25-pair cables and terminate them on existing 66 blocks or install new blocks if the spares had been used.
At least 1.5 hours depending upon the length of the cables.

Then you had to terminate a 25-pair Amphenol connector on the telephone end of each cable. 5 Minutes each if you were experienced enough and had a nice lunch date planned with the cute little civilian woman from building 13, otherwise about 15 minutes each. Why hurry? LoL

Then you had to locate the desired CO lines and figure out the best way to include the new phones into the daisy chain WITHOUT killing service to existing telephones for any length of time if possible. Depending upon how many telephones the line was connected to this could be a 2 minute task or up to 30 minutes.
This was repeated for each line.

Next you had to figure how to make the desired lines, ( and only the desired lines ) to ring on the telephones. This also could be a 5 minute task or up to 30 minutes or longer. And in some cases it was simply impossible to set it up precisely the way the customer wanted because of the common audible wiring. In those cases you got it as close as possible. This was usually not a problem for me as an installer because the surveyor had explained this to the customer in advance.

Finally, each line had to be tested at each phone, the phones labeled, the workorder signed, and the equipment room cleaned and secured.

Keep in mind that in the above scenario all of the lines were already installed on the system.
If new lines were to be installed it would definitely mean returning after lunch.
In that case you would have to test pairs to the building with the CO ( inside plant ) test board, install a new line card ( 400D ) in the 584 panel if there was an available slot, then connect the CO line to the telephones.

But with all of the headaches and effort…. It was so nice at the end of the day to know you earned your every bit of your pay.