Ten minutes, maybe five minutes if the school is small enough physically to get between rooms in that time. The break is definitely not meant to be long enough

Ten minutes, maybe five minutes if the school is small enough physically to get between rooms in that time. The break is definitely not meant to be long enough for more than "get to your next class" - and that's from someone from a relatively well-off suburban school district. Elementary school gets recess, don't remember how long. Middle school I don't remember very well; high school you just get lunch (but are perhaps not restricted to one room to have it, at least).