Brown means it's old blood. It's bright red for a few days after it bled, and then the red blood cells break down and release the iron, which immediately rusts so they go brown. So the fact it isn't red any more means no new bleeding - you're just washing out what bled a while back.
It took me about 3 weeks to flush it out with daily ejeculation, although I think the leaflet I was given said up to 6 weeks.