Rollei 400 IR Film Expired

I have a roll of Rollei 400 IR. It expired in 2009, but was refrigerated. I'm thinking its about half as sensitive as it would be fresh. I will be developing it in Rollei Supergrain, but wonder if I should give the film more time in the soup. Any thoughts?

If it's been refrigerated I suspect it should be fine.

I was given a box of film that was expired for decades. I shot the TMax 100 at box speed and developed it normally, and I was surprised that I got good results out of it. I pushed the HP5+ one stop in development, and I got good results as well. The one film that I did have go off was Provia 400X. Instead of refrigerating it, I left it in my bag for a few years.