I work in finance and am sorry but you don't sound like a legit investor if you measure the effectiveness of your capital towards startups by work hours. What about their revenue models, plans for growth, talent structure and market niche? Why do you expect them to work longer hours as long as they have deliverables on time? Also, working longer hours may introduce potential compliance/HR costs (mental/physical problems due to overwork, people leaving due to work-life balance issue), which could be deadly for early startups.
> I'm sure that they do in the overwhelming majority of successful startups
You would need to back up this statement with evidence and show positive correlation between longer work hours and success of startups.
> I'm sure that they do in the overwhelming majority of successful startups
You would need to back up this statement with evidence and show positive correlation between longer work hours and success of startups.