I also believe it is 8 weeks OOP.
when we got new gliders, we would start feeding them OHPW with fruits and veggies. one of the salads from critterlove.com. at first they would only eat wombaroo, and not eat any fruits/veggies. after a week or so they would find corn very tasty. then I would see peas eaten. then weeks later I noticed most of the fruits and
veggies eaten up.
the last 3 I got seemed to take 2 months to fully eat everything, none starved or died. they were all very skinny when I got them. they go nice and plump once they started eating it all.
I would just make sure they are eating the wombaroo. maybe HOURS after putting food in the cage, offer a few fatty treats. Live mealworms. give them time to
adjust and try the new diet.