How long does it take to change an amendment?

Question

because u heard if obama becomes president, he's going to change the 2nd amendment.

Answer 1

The president cannot amend the constitution. Congress has to approve an amendment, and a certain percentage of state legislatures must vote in favor for it to be ratified. There is no time limit unless congress sets one. The record is over 200 years (27th amendment).

It would be in your better interest to learn how your government works before you spread rumors from uninformed people.