I've picked up a bike from a dealership and had it only firing on one cylinder (it was a v-twin). I didn't clock the lack of power in the car park and it only became apparent until I tried to pull away onto the main road in front of a truck. From another dealership, the front brake was so loose that the first time I pulled it in anger, it rotated right round the bars.
Both problems would have been spotted (and potentially very serious accidents avoided) had the dealerships concerned tested the bikes prior to returning them to me. So would I have a problem with a 10 miles test ride? Not at all, but it's approaching the limit, distance-wise of what I'd call excessive; 20 miles I'd consider too much and would query. You're supposed to shake down my bike to shake my bike down, not run errands or joyride.
I like my bike because I can overtake 4x4s down farm tracks with a week's worth of shopping on the back.