fred wrote:

Anyway. Assuming the alternator wasn't charging at all how many hours does the team think
the engine would have run on a new battery alone ?

No idea but, in mathematical terms it'll be: Petrol common rail Diesel
mechanical injection Diesel - each requires less battery power to run
the engine than the previous.

(And that only holds at this time of year. In cold weather some common
rail Diesels use their glowplugs whilst running to keep cylinder temps up.)

--
Scott