I know that too, NLNH told me that when I got my pair. But since the recommended time is more than 200 hrs (was told 100hrs before), I was thinking it has to be 200 hours of orchestra only or all kind of genres.
I'm currently travelling around India now and I intentionally left the foams back home. So far I was walking around streets of Mumbai wearing these. They don't have a good fit, but they don't fall off unless there is sudden turbulence.