How long to charge a car battery?
by 
The Curious Bag
ANSWERS: 2
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Batteries are charged at varying rates depending on requirements. Common rates for slow charging is 14 to 16 hours, quick charging is three to six hours and 45 to 60 minutes for fast charging batteries.
Source:
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If its not totally dead and you need enough to start, 5 minutes with a battery boost battery connected will most times pull up the voltage enough to start up. (done this many times)
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