I expect you can get that extra 4 weeks since it is only their bedroom. I don't know how big a 9 week old goose is, but they certainly aren't going to need more than the available 4 square feet each just to sleep.
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Okay, I just realized that I have a pair of 6 week old goslings currently using the same sized kennel as a bedroom each night.
I don't know if all breeds of geese grow at the same rate, but I calculate that I will get 2-4 more weeks out of the kennel before larger quarters become necessary (Poms grow very quickly between 5-8 weeks....are 2/3 adult sized by 9 weeks) and I have to move them in with the older juveniles.
Now, I don't recall, but think you have a pair of Africans? If so, they are much taller geese than my Pomeranians. However, since I have no experience with them don't know their growth rates/patterns and accordingly cannot offer anything other than practical advice.
If the pair can stand up straight and lay comfortably in the kennel each night you should be okay for a while longer.
As soon as they can't fully stand without hitting their heads, or look overly crowded, I would move them. Sometimes I will sneak out with a light and check them well after dark and see if they have enough room and are sleeping comfortably. Now you have to be VERY quiet when doing this or all you are going to see is two geese standing there waiting for you to bring them something or visit.
Hopefully, you still have a couple weeks, so you have time to get their housing built.