Of course these slippers are not intended for long-term use, but I seem to have squeezed more than 3 1/2 years out of the first pair before I decided that it was simply too worn out.

A couple of days ago, I switched to the hitherto-unused pair. This picture shows you what more than three years of using slippers intended for only a few days' use does to them.
I hope I'll get as much wear out of the second pair as I did from the first.