Having a scheduled round I have found in the last 3 years I am very rarely more than a days work behind...the last freeze we had I did have to skip about 7 days work but that is rare and of course saved for.
I believe that if I had round where I could turn up when I 'did' I would get very lazy...this way of working does make me get out of bed.
Horses for courses.
Cheers
Dave.