60 minutes, after the battery loses power, idle for 60 minutes, the battery is basically fully charged. The details about idle charging are as follows: It is best to charge while driving, not idle charging.
It can be charged at idle. Idling for a long time, the engine combustion chamber will produce carbon deposition. The idle charging effect is basically not ideal. Cars running in place can cause exhaust poisoning. If it's in a garage, the percentage of accidents is very high.
In this case, the battery can be charged for more than 60 minutes, if it is only short term out of power, as long as the charge is 60 minutes to 40 minutes, if the long-term power loss time is longer