Steve, you have the lens, ask it what it can do for you.
If you contact print, you'll be fine to at least f/64. As I wrote, resolution needed in the negative depends on how much the negative is to be enlarged, i.e., on how big you want to print, and on the distance at which the print will be viewed. There's no hard and fast rule that fits all situations.
FWIW, I have a Wray process lens, viz., a 14"/10 Process Lustrar Series II that stops to f/90. I got it to use, if I used it at all, on 2x3, so tested it hung way out in front of a Nikon. Remember, for me all that matters with a lens that long is image quality at the center. It was best at f/22, not really usable at larger apertures. I don't use it. When the situation wants a 360, I use a 360/10 Apo Saphir.