To jump-start a dead car battery, the process typically takes about 10 to 15 minutes to get the car running again once the jumper cables are properly connected and the working car is running

. Here is a summary of the key points:

• After connecting the jumper cables correctly, start the working car and let it run for a few minutes (usually around 5 minutes) to transfer some charge to the dead battery

• Then, attempt to start the car with the dead battery. If it doesn't start immediately, wait a few more minutes while keeping the cables connected to allow more charge to build up

• Once the dead car starts, keep it running and connected for a few minutes to stabilize the charge.
• After jump-starting, it is recommended to drive the car for at least 20 to 30 minutes to allow the alternator to recharge the battery fully

If the battery is completely dead and unable to hold a charge, jump-starting may not work regardless of how long you try, and the battery may need replacement

. Revving the engine of the working car to around 2000 RPM can help charge the dead battery faster during the jump-start process

. In summary, expect about 10-15 minutes for the jump-start procedure itself, followed by at least 20-30 minutes of driving to recharge the battery properly. If the battery is severely damaged or dead, jump-starting may not be effective at all