Read the label on the battery. You're looking for Ah. Amp hours. Say it's 48. A 4 amp charger will take it to fully charged from dead flat in 12 hours. If you mean by running it what's the output of the alternator? Net after drain of running. Say 10 amps. Then 4.8 hours.

You won't find that info. Manufacturers only rate batteries with cold cranking amps and load test amps/volts. Charging times can't be predicted due to the type of charger, temperature of the battery, and the charge state of the battery. Type of charger means a large, high rate type or a trickle charger.

There is not a set time for charging a Battery! It depends on how run down it is and the output of the charger.

Hi that would be from the manufacturer of the battery.