I have 2 nevilles haze (mr.nice) in flower right now at 5 weeks. These have a bigger stretch then any of my other hazes (purple Colombian haze, CBH x a5haze, Bangi haze, and WiLd Haze. I would say nevilles Haze had a x5-6 stretch.
I always begin long flowering sativas (12-16wks) in smaller containers and only up-pot when needed, sometimes never... However I am extremely dilligent in my garden, so this may not work for the hands-off grower.