My company has Unlimited PTO, which means nobody knows how much vacation is too much. How many days do you take per year in average (Excluding Holidays)?
Startup? Normal startup jobs typically offer 3 weeks. Saying "unlimited" is kind of a scam to get you yo take none. I'd probably keep track myself and take three weeks per year. A lot of your coworkers will take none. A few will take 5-6 weeks per year because they can and then will quit soon after pushing it.