Mike, I usually take as long as I need. It is usually an hour or so for me.
I take the car home and reverse up my drive, to see if it fits primarily and see what the mirrors are like.
Then take it around a few speed bumps to see how it copes, and then park up at a kerb to see what tis liek getting in and out.
The mirrrors thing…caught me out with the Pug 2008. Its mirrors are quite small and not very good.
I would guess, take as long as you need, dont overthink it, just enjoy the drive.
I’ve taken the cars home, had a coffee and went out again.