I remember being in my local Vauxhall dealership collecting some parts, when I overheard the workshop chargehand giving a young mech/tech an earful about including tidying up within the time charged for a job - he made it clear that his next job would need to be charged for that time.
Keeping your own records, yes I know a bit about that, I have yet to attack the box file for my daughter’s previous car and it was sold back in August - I need to reclaim that folder for or her current one!
Service, repair and MOTs along with any faults logged and winter/summer tyre changing, then a list of all non service/repair parts bought, then records of summer and winter tyre positions and accumulated mileage, then finally any tricky/nasty investigation and repair events - her previous car had a battery draining issue (BCM duff S/W) and individual upgrades performed on that car.
When she signed up for her Leon Cupra, she immediately put her late 2009
Ibiza SC up for sale, a small dealer bought it but requested its full service record, so all I needed to do was to sanitise my rolling service/repair record and email it to her - that car was sold on by that garage as described as having “full service history” !!