You wouldn't want to re-use solution like that. A lot of the reason why growers use a run-to-waste watering system is because the extra run-off helps to rid the plant of the salts and other waste products it produces as it grows. Feeding it back to them would be kinda like drinking your own urine.
edit: I'm actually not sure about that since you'd be using a hydro system the rules might be different. I'll let somebody else correct me if I'm wrong so only count the drainage part of my post as fully accurate
As far as drainage, coco drains rapidly. Very rapidly compared to the soil mixes I've used in the past. Pretty much as soon as the medium becomes saturated you will start to see run-off.