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Can't say exactly but I've done, say, 6/7 hours with it on going between low/medium and it was fine.
Battery is a universal style and you can easily buy spares on amazon/ebay for basically unlimited burn time.
The battery can stighly rattle inside but I just put a couple strips of electric tape on the inside and it hasn't been an issue again!
Genuinely quite a good product.
IdealStandard
snoops
samrensho
I got a Lumintop B01 of Aliexpress and has been perfect for overnight audax and nighttime offroad riding. Very long battery life and replaceable batteries too.
Has a cutoff beam so it doesn't startle drivers... for whatever that is worth