To slow menz and why aren't you sleeping yet lol. We should be sleeping just cause we didn't win the contest of the other vape waaaaaaaaaaaaaaaaaaaaaa. Simmy it should have come with two caps. One in the box and one in the INH. Run time is just how long the unit runs after turning it on...no herb necessary but to do how many you can run eventually you might want to use herb but don't have to. Oh be careful removing the cap. If it feels stuck don't try to force it out it will break. The unit should be heated if it is stuck then turn it slowly counter clockwise till it releases and twist it out. Edit: Just read your post again...not the cap on the unit, I am sorry the capsules.