Rootbound is when the roots no long have space to expand that isn't true?2 weeks maybe 3 if your trying to keep it small.
On another note-
Technically you could keep it in there the whole grow if you wanted, your plant wont be as big though. Root bound is a myth, you dont have to transplant ever if you dont want. its just your plants wont get as big as if you'd moved to larger containers.
It depends on what definition you use I suppose. I was saying you can keep a plant in a small container its whole life with it having a full root system without any problems from it being "root bound" other than since its got a smaller root system to support the canopy than if you transplanted you get a smaller plant. People do party cup sea of green grows w/o any problems.Rootbound is when the roots no long have space to expand that isn't true?