Ok, points to you for coming back to apologise!
To answer your question - well, obviously it depends on everything else they're doing, doesn't it? If I can do one hour at numbers 1, 3, 4, 6 and 9 on the same street, I might be fine. If I'm doing numbers 2, 5, 8 and 10 in the afternoon, I'm delighted. What isn't ok is doing one hour for you, then driving for an hour to my next job.