I usually keep my phones for at least 3 years and change them only if it,s not working anymore. I understand people who feel the need to change, bu for me as long as it's doing the job I don't see the point for changing just for the sake of it.
In my case, I usually go for 1 hour session especially for the first encounter to get to know the girl and see if there is a potential connection. Unfortunately, I can't go for 2 hours which would be better, but it's over my budget most of the time.
The only time I had to cancel in a short notice (2 hours before) was because I felt sick that morning.
It turned out that I did well to not see the girl, otherwise I could've contaminated her. But I still don't know how she took my cancellation.