I've heard that it doesn't do anything additional to your hair if you leave it on for longer than it says to. Usually if there are more benefits to be reaped from a product, they want to tell you so you'll experience it and want to buy their product ...
Yes it is ok. Color care shampoos and conditioners just add extra moisture for hair that has been damaged by color. Just be careful because some shampoos and conditioners, such as ones made by Redkin has tint in them, Otherwise, wash away.
Yes it will work and it will not cause bubbles:- because hair & fabric conditioners are both oil based and will kill foam. Don't use too much because fabric conditioners contain approx 2-4% actives (& over 90% water) and Hair conditioners are approx ...