I've never taken hormonal birth control, but from what I've heard, it varies greatly. I know people who had a regular cycle right away and people who took months or years to go back to normal.
Were your cycles regular before you went on bc? I've heard that that can make a difference.
Get used to me. Black, confident, cocky; my name, not yours; my religion, not yours; my goals, my own; get used to me. -Muhammad Ali