Sweden has 5 weeks of vacation and a 40 hour standard work week, and pretty successful companies such as Spotify, Skype, Voddler, SoundCloud, Flattr, etc, were

Sweden has 5 weeks of vacation and a 40 hour standard work week, and pretty successful companies such as Spotify, Skype, Voddler, SoundCloud, Flattr, etc, were founded here. I doubt most of those founders only worked 40 hour work weeks though, as an entrepreneur you decide your own hours, and overtime for regular employees is not uncommon. It probably varies a lot depending on company culture. A friend working at a startup recently got hi-5's from the bosses when he said he had worked 11 hours a day the entire previous week, no talk about taking compensation leave to rest or anything like that. At my company (not a startup) an 11 hour day would be pretty extreme, and if my boss was aware he would probably insist I come in late the following day.