It depends on a lot of factors... When I was a teenager and would blow dry my hair, it would take up to thirty minutes. (I had long thick hair). Then since college, I've had about medium length hair, still thick obviously, and when I get out the shower, I let it air dry while I brush teeth, put on make-up, get dressed. Then I use a straightener that both straightens and dries hair, and with that, it takes around 25 minutes. But I love it.