That's a normal genius bar repair, not the one on one service being described. Two different services.
Nope that is the one to one transfer.
Bar appointments are 15 minutes according to the schedule. No way could you do a full data migration of any decent amount of data in that time. Thus you leave them and get them back in a day or two
----------
On the front end, there was no need for a genius to get involved. As a specialist, I could handle the initial transaction and then hand off the computer to a genius who would perform the migration in back of house. No genius appointments necessary, at least not when I worked there.
The techies do the paperwork now. My guess is too many sales folks getting the paperwork wring and/or making promises that couldn't be kept. So now the people doing it do the intake
And given that the intent is to setup your new computer I think 14 days after activating your one to one is more than enough.