As far as how long it takes to put charge back in I know on a BMW 316. A friends wife had a job that was 1.2 miles from there house and the battery would need topping up in the winter every couple of weeks or it would not enough power to start the car. She swapped her job for another 2 miles from there house and now it is fine.
As a buy the way we fitted a new Bosch battery the first time it would not start and this made no difference. The alternator was putting out its full voltage.
So somewhere between 1.2 an 2 miles is the answer.
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