How long should Canon ixus2 10 be charged for the first time?

Charging for more than 10 hour or more than 20 hours is the old calendar of nickel-cadmium battery with strong memory effect. That battery has a strong memory effect. Let it "eat" and "remember" for the first time, which will help improve efficiency. Today's lithium batteries have no memory effect. No matter the first time or every time after, as long as the indicator light of the charger turns green, it means that the battery is fully charged and can stop charging. Don't look at the time when charging, just turn the indicator light of the charger to green. This is the charger that has been designed.