Hello, I am temporarily unable to devolop my own sheet film and will be therefore relying on A&I in Los Angeles to process it for me.

A&I uses XTOL straight (undiluted) at 72F. I rated my sheets at ISO 3 with the 89 deep red wratten (B+W equivalent) for the true IR effect.

Question, for IR820c, in straight XTOL, 72F, what development time would you suggest?