Does hamster need to be potty trained?

yes, to be totally frank you can. i do not know how long, but it is possible, if you try looking up the type of hamster you have and see how long it takes to train it or how intelligent it is, i am sure you could find out a average time by that. but yes it is possible and many people have done it already. there are a lot of benifits from it, so i would give it a go.