For professional jobs, 10 days + a separate pool of sick days was pretty much the norm in the US as I understood it. For experienced people, more like 3 weeks (and possibly longer as you get to the 10 year or so mark).

These days with pooled sick and vacation/personal, my personal experience suggests 20 or so days as a starting point for large-ish tech companies. I'm sure there are some/many that give less but I know what I've personally seen that wasn't considered extraordinarily generous.