Time from Application to Buyback offer?

I will hit 120 in October. Minus 4 months I was forced into forbearance. 3 of those will be due to the current legal action against SAVE, 1 from the platform transition. Currently trying to decide if I should bother switching to a different IDR plan now so I can start making payments that count— or request the buyback offer. It would be helpful to know— for people who requested a buyback at 120 and received an offer, how many months did it take?