How can I become a cosmetologist without full-time to dedicate to cosmetology school?

I want to be a cosmetologist some day. Sooner rather than later. For now I am a sophomore in college, not studying for hair at all, doing liberal arts actually. It’s not like I want to quit doing that. I want to have cosmetology on the side.

Then I can open a salon that has Plato and Descarte on the shelves. But seriously I am wondering from people who know how hair school works, how long does it take, can you take it while you have a full time job, Kind of on the side? Any suggestions?