good starting point for developing Rollei Retro 80s in stock D76?

I have a roll of Rollei Retro 80s, and was wondering if anyone has experience shooting this in stock D76? I've seen some develop rollei 80s at EI 80 in 1:1 D76 at 12.5min at 20C. Is there a base time at 20C in stock D76 that you could suggest I start off with?

Any suggestions?

Thanks.

I would like to try this too. I used it a bit in RLS and the results were spectacular. It should work in any normal developer, since it's not a document film or anything of that sort.

I've only used the film in Xtol 1+1