I need something that will keep a substantial mass of fish frozen on my annual migration from Newfoundland to Ontario. Packaging densely without air pockets in stryrofoam sealed boxes gets me about 48 hours or a little more. With good planning of ferry, etc. that will almost get me there. However, it doesn't allow any stops enroute to visit friends.

Can I build something that will work? Can you estimate the number of hours that I would need to run the vehicle every 24 hours to maintain frozen fish?