the less gliders involved the less time you will probably need as the glider
should want to have others in the colony. we had more difficulty with the larger
colonies. also I tried to reintroduce 2 into 6, but the alpha male said NO WAY. After 2 tries my wife gave up, gus was just to resistant to more.
I think my wife did it once at 2 weeks and it went fine, but I always wanted
to do longer like 4 weeks.
Also the last time we did it, 4 colony with 1 lone glider, I left 2 sleeping pouches in each cage, I would swap only one pouch, the one they slept in. I notice that every time I
made the pouch swap the gliders picked the scented pouch to sleep in, so they
seemed to be excepting the new scent, the intro went easy, all 5 were happy.
so group size, alpha glider acceptance and see who they react.
I would say try two weeks then put them in the bathtub and see how it goes, if they fight, then keep separate and try in a week later.