It does depend on where you work..

But in general, the American Protestant Work Ethic combined with a go-go-go / win-win-win and goal setting/achieving culture means the majority of Americans get 2 weeks / 10 days. The younger generations scoff at this more and policies slowly change to reflect that but even so many companies simply don't start anyone with more than 3 weeks / 15 days. This is separate from the usual 1 or 2 weeks of paid sick leave.

I work for a large bank. Sick leave and vacation/holiday time is pooled as one, and I've got 5 weeks a year to use as I see fit. And I find it's still not enough for my wanderlust.

When I worked elsewhere, my boss would allow me to take additional time off without pay. As mentioned above, a 3% pay cut for 100% increase in time off. 2 weeks unpaid out of 52 weeks a year amounts to about 4% income loss and it's fine by me.