What developing time would you use?

I received a Grafmatic loaded with sheet film. On the info tag on the grafmatic is Royal Pan with ASA underlined underneath, line 2, GSM church pix on line 3.
The notch code matches the generic special order code for Kodak B&W process films. The same code appears to be used on TechPan also.
My only developer is HC110. I've looked at the times listed in the MDC so there is no need to repeat them.

Thanks,
Charles