Most tours will be 6 days (7 days for large cabin fleets but that will not be for new hires). You will occasionally get a 4 or 5 day tour to accommodate training or vacation but 6 is the standard you can count on 90% of the time.
If you don’t want to be away from home regularly for 6 days at a time then don’t join NJE. Simple really. Also don’t join with intention of going straight on to part time. It won’t work out for you.