Hmmmm... About 3-4 months, but that is just a little hair cut because I've had very looooong hair since I was three. My parents are trying to make me have my hair cut more, but I'm always like -> when they try.
Well, disregarding my toddler days, I think it's like 6-7 weeks. I hate having long hair, because that means I have to work on my hair, and keep it looking good. So I like to keep it somewhat short.