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Just because I wanted to put it through the paces, here are the results of a non-scientific battery length test I performed using the Nichia LED emitter on HIGH output:
15 minutes - Rayovac High Energy Alkaline (I might try this one again, surprised at the terrible performance here)
35 minutes - Eneloop White Rechargable NiMH
60 minutes - Energizer Ultimate Lithium!
I kept the flashlight in the fridge during testing because it got pretty hot and didn't want to risk damage. I checked on it every 5 minutes, and when it was noticeably dimmer I called it a done deal. I wasn't measuring lumens, but the output dropped very quickly with all 3 battery types at the end.
My recommendation: Use rechargeables, but maybe splurge for some EULs if you are going on a trip/camping/whatever.