How long do I leave my DT fish free?

[prodman]

I have my fish in a QT I treated them with cupramine for 3 weeks and I need to know how long to leave my display fish free? I have seen anywhere from 6-8 weeks recommended? Which is it
Thanks

 

[e55MD]

I would go with 8 weeks. I did it for 6 recently and the ich came back.