I only walk 100m each way from my lock up to office and then maybe a little bit on rides in and out of cafe's or controls or stopping for a piss. Plus I have maybe four pairs of shoes that all get used for different things. I really try not to walk in them much. If I can, I'll take my shoes off.
Willing to bet they're as soft as the Sidi heel rubber and will last 4 months max. I managed to wear out a set of coffee covers!