2 weeks. I still live in the same school district and it still is 2 weeks.
My Granddaughter lives in the Los Angeles Unified School District and they take 3 weeks.
Schools here are out a lot more than when I was in school. A week for Thanksgiving instead of just Thursday and Friday. A week for President's DAY, instead of just one day. And every Thursday is a half day for students, the other half day is for teacher prep time.