Straight out of the shower if I blow dry it and brush it, it takes somewhere around 20 mins.. my hair is pretty easy to straighten, especially since it's shorter now. But if I had my hair styled wavy/curly with products and everything, I have no idea, but it'd probably take an hour or so.. haha.
Mostly 2b with bits of 2c in the front (Fia)
High Porosity (Color treated/flat iron damage)
Fine to Medium Texture
Mod CG since Sept 2011
Co-Wash: Tresemme Naturals Moisture
Low-Poo: Renpure Organics Moisture
Leave in: Shea Moisture Curl Enhancing Smoothie
It takes me about an hour and a half to two hours to straighten my hair and that's barely brushing my shoulder hair (after it's straightened). My hair is so thick the just the top half section of my hair is a full pony tail for a lot of people. I have a ton of hair that's why I only straighten it once every two months and that's just because I'm keeping track of my hair growth and it's easier to keep track of the growth straightened. Once I reach my goal length (which is like demi lovato's length) I won't straighten it at all or just once a year.
2c/3a with some 2b-fine/coarse-iii-low porosity-normal elasticity Started CG 10/16/12
Co-Wash:Sauve Naturals Conditioner:Tresemme Naturals Conditioner Styling Products: La Bella Lots of Curls gel
Sometimes it will not straighten, it just gets wavy and frizzy instead, no matter how many times I straighten it -_- But on a good, dry day, with barely any humidity, then it takes an hour. But this really doesn't happen, unless it's winter, so in the humidity it can take up to two hours for it to be "straight" (well, as straight as I can get it).
I shower at night so if I leave my hair curly the next morning it takes about 30-45 minutes to straighten. As I straightened very often I developed strategies to make it take shorter time. But usually when I straighten I blow dry my hair at night while brushing it (which takes about 10-15 minutes) so it's easier to straighten in the morning and only takes about 20-30 minutes.
But I pretty much stopped straightening my hair. It's too much trouble plus it doesn't ever really stay straight.