How long can a war take

depends on who is fighting and what it is about. the cold war (1947-1991) was four years before it ended when the berlin wall fell. and the french and indian war (1754-1763) was seven years because the french were driving out the native americans here in the americas hundreds for years ago

7 to 12 years normally but can be shorter or longer

Explanation:

i think it was   tsar alexander ii