Willing to bet you that it's less than 50% of total shops, therefore less than the word "many".

"many" ≠ "most". There can perfectly well be "many" while still being fewer than half.

You're totally right, I messed up my English! It's too early.

There could be 1m of X and 100m of y, for example

Probably, which why I said "many" and not "most".

It's not a thing in big faceless corporations, chains, etc, for example (though it can be a thing in places like Google, MS, etc, with the right manager).

But on small businesses (e.g. 2-20 people) it's not uncommon in certain countries (thinking of Southern Europe that I know of) to have an understanding when one needs to leave. There are also practices like "siesta" where places close for a few hours altogether and people have lunch etc.

I was also surprised to see the hours kept in french towns (not Paris, smaller, but still big ones) that e.g. shops opened casually at around 10am, many were closed at lunchtime, and reopened again later, etc.

I'm pretty sure this is the case elsewhere without the "protestant work ethic" (or Japan's version of the same, instilled after lots of humiliating defeats on the hands of the west), e.g. Africa, Latin America, and so on.