If a car battery goes dead and you have to jump start the car, how long should you keep the car running to get a decent ammount of charge back in the battery?
at least half an hour minimum really if you are just idling it, but half n hour of motorway driving should fully charge the battery, well thats what i've been told.
in my experiance (not with my bravo but fiesta), when the battery was dead and i had a jump, i litterally had it running for about 5 mins. Then switched engine off. Started fine again bout 2 hrs later