how much caffeine does oolong tea have?
 When steeped for 5 minutes, tea has about 50-70 mg of caffeine per cup of tea. Oolong tea is usually steeped for a much shorter time so there is significantly less caffeine. In addition, oolong tea leaves can be brewed multiple times, and each time the caffeine levels decrease by about 75%. By the fourth infusion there is almost no caffeine left. 