I have done this before... mostly from sheer laziness and lack of time at first haha. Think I started a thread about it here somewhere once upon a time... might try and find it.

Will be watching with interest. It has been about two weeks here since I washed, I generally go about a week or two. The worst for me is around 3-5 days past washing but once I get through that it is great. Might be inspired to just keep up not washing...

I don't colour my hair and it is naturally dead straight so never had to worry about those things.

ETA: Found the post; here you go.