What everyone else is saying. This time is not loggable. You also (and this is seperate) don't want a logbook with entries that show no PIC, SIC, dual, etc.
If the PIC is an MEI they could give you dual. I wouldn't do more than a few hours of this, though. Put it this way. If someone came to me with a resume with 600 hours of dual received in a Cheyenne, that person would not be getting a job.
Just trying to help you out, man. Better to go find something else than waste your time.