Efke 820 IR Aura in rodinal?

I want to develop some Efke 820IR Aura, 120 size. in Rodinal.

I went to the "massive development chart" for times. The chart gives me a tine for sheet but not for 120 or 35mm.

Sheet film, Rodinal 1+50, 20C, 14mins.

Any suggestions? I have 11mins. written in my notes

The massive dev chart app on my iPhone says Rodinal 1+25 for 9 minutes for 35mm. I used that for a couple of test rolls of 35mm and 120 and it seemed to come out fine.

Duncan

Well I processed the film in 1+50 @20C for 12 min. and you can see a couple of the images in the gallery. 11-12 min. works well for me.