Struggling to know how long does it take to charge a car battery?

The simple answer is that it may take 1 hour to 1 day.

Why this variation? Because a car battery charging time (260–16) depends on many issues.

What are those issues?

The factors are the amperage of your charger, applied voltage, cleanness of the terminal, thickness of the cables, temperature, initial depletion, condition & quality of the battery.

But, remember, charging a car battery time (260–16) mostly depends on the amperage of your charger.

If you have a high amp charger, (40–44) it will take less time to recharge your 12-volt car battery. On the other hand, a low amp battery charger will take more time to recharge than a high amp one.