We get 13 days - sick/personal combined. We can bank whatever we don't use. We used to get paid a certain amount per day of whatever was in our bank once we retired, but there's a limit now. It's very helpful for maternity leaves, though!
I have taken four days off before to do our very first family trip in 2005. We were transitioning principals, but my current administrator didn't have a problem with it, she told me, as long as it wasn't a yearly thing! Of course, there are people in the building who have taken an entire week for the past couple of years in a row for cruises, etc...I know we're very fortunate, though. I can't complain at all about our leave allowances.
We have a new superintendent, however, and money spent on subs is being scrutinized. We're being strongly discouraged from taking time off before or after breaks, though we haven't been told we can't yet. I'm not sure how things will change in the future. DH and I would love to see the Christmas decorations some day, and so we've discussed taking two/three days off around a weekend in December and flying out. We have to do this in the next three years before my oldest goes to the middle school, though, so hopefully we'll get it in!