I ticked the 2 year box but I would like to have seen a longer time span as a choice.
I found out a lot about loyalty when I was too ill to work for about 6 months (and mailshotted everyone to let them know what was going on). I lost some customers who had been with me for ten or twelve years. Some who had only been with me a year stuck around.
I don't feel that loyalty is the right word really. Generally, most people don't like change and it can be rather the devil you know than the devil you don't. However, since regaining my health, I have given a very reliable service to everyone and have not wavered from the six weekly intervals even in Winter - give or take a couple of days.