Mag 2D will run for around 30 hours at a level as bright or brighter then the stock bulb. It will start out very bright and then throttle down a bit due to thermal regulation but once it settles down it will run and run and run. Like I said even at 30 hours it is brighter then stock by a good margin IMO. It has been said that once it falls into moon mode at around 31-32 hours it puts out about Fenix L1P levels.
Chris