Run time is based on the season and location. Northern climates will have a run time during the summer months of 8-12 hours, and 4-6 hours during the winter months. Southern climates will have a run time during summer months of 8-12 hours and 6-8 hours during winter months. The solar post lights need direct sunlight to charge the battery/ batteries. Mounting under trees, under eves, etc., will inhibit the ability to charge the unit.