Ask HN: Is overtime to be expected working for a startup?

I know an original founder of a startup must make it their life (or even if it isn't a startup, the CEO often must do so).

I'm applying to various startups in SF, as a developer, and want to know if I'll be taken seriously if I communicate that I will only work paid overtime. Has anybody here been hired to a tech startup in SF and what was the expectation?