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12 volts only refers to the voltage, to be able to say anything about charge time you also need to know the capacity rating in amp hours of the batteries. Assuming lead-acid batteries the charger needs to go to > 14.4 V and then a proportional amount of amps as compared to the capacity rating of the batteries. A rough approximation is that batteries needs to be charged with about 1.4 times their amp rating. An 1 Ah battery would need 2 hours on a 0.7 amp charger for instance.

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Q: 4batteries are connected in parallel what will be the required current of the charger to charge these batteries in 2hours 12volts batteries?
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