They don't publish that because there are so many variables. Installed pulley ratio, engine RPM, cold plate size, box size, insulation etc... I can take our Sea Frost plate down to -18F in about 35-40 minutes at fast idle. Or about 30 minutes at cruise RPM.. Every plate and install will be different.At any rate- Grunert and Sea Frost appear to post specs except for average run time. Likely due to variations in box size and insulation as well as climate issues.
Did some more digging in forums and the short answer is about one hour every 12 hours in the tropics and less in cooler climes. Initial cool down will take longer. A rough average rule of thumb.
My Sea Frost plate has two separate coils inside it one for the engine driven and one for AC or DC... This is a system Cleave offered for when on shore power to supplement the engine driven system and was called Shore Assist.Maine, on the same circuit or two sets of lines?