After a successful jump start, you should run your car for at least 20 to 30 minutes to allow the alternator to recharge the battery. However, the ideal duration depends on how depleted your battery was and how long you'll drive immediately after.
If your battery was completely dead, aim for 30 minutes of continuous driving or idling to restore a meaningful charge. During this time, the alternator converts mechanical energy into electrical energy to replenish the battery. Gentle driving is preferable to idling, since the engine operates more efficiently under load and generates more charge.
After the 20–30 minute period, your battery should have enough charge to restart the vehicle on its own. However, this doesn't mean the battery is fully recharged—that typically takes several hours of normal driving or a dedicated battery charger.
Important considerations: avoid turning off the engine immediately after the jump start, as restarting could drain the battery again if it hasn't recovered sufficiently. If your battery dies repeatedly or fails to hold a charge even after a full recharge cycle, the battery may be faulty and require replacement. Additionally, identify why the jump start was necessary—whether due to a dead battery, parasitic drain, or alternator failure—to prevent the problem from recurring.