I'm including everything from applying shampoo/condish, washing, etc. and so I'd say about 30 total. This 30 can be divided up two ways. 10 of it is almost always usually me pre-shower putting in my shampoo or conditioner and then washing it out. Next possible 10 is me drying lightly with towel, combing through a bit, applying my moisturizer and oil, then tossing it up lazily into some type of crappy pony/bun/combo. The last 10 minutes would be the next day (morning) or just many, many hours later when I'm not lazy anymore, and that would be me neatly brushing my hair into a bun good enough and presentable enough for work. This takes 10 minutes because usually I am not satisfied the first time (rarely am I, lol), and so I normally end up redoing the bun once or even twice.
The other way that 30 can be divided up is again 10 for the pre-shower/during shower shampoo or conditioner applying/washing/etc., all that, and then the next 20 is basically me drying lightly via towel, combing and brushing, applying a little moisturizer and oil, AND putting my hair up into a secure bun good enough for work the next morning (this is usually when I work really early and don't feel like doing my hair at 4 am, and so waking up with it done gives me an extra couple minutes of sleep.....which sooooo matters I tell ya!). I then wrap and wake up the next morning good to go, though I'll usually put some more moisturizer and oil just to last the day.
So on an average day about 30 minutes total....which I don't think is much. Especially considering I am slow and not a hair person at all, lol, and my hair is so thick and what not.