Here in Sweden you have a legal right to take four weeks in a row during the summer months.

Now there are some conditions.

1. You have to have enough days earned.
2. Your employer may direct you when to take the vacation during the summer months, but has to communicate that well in advance.

You don't have to exercise this right, but your employer can't outright deny it.

Typically people earn enough vacation time to take four weeks during summer, one week during christmas and a random week in the autum.