Have a SF Runtime Question

[RedLED]

Can someone please tell me the runtime on a SF Outdoorsman E1L (single stage) with KL1 Head?

I am loaning this out for a group going on a camping trip, and want to let them know how long it will last.

Thanks in advance,

Redled

 

[jhc37013]

Here is a little review with the K1L head.

http://www.flashlightreviews.com/reviews/surefire_kl1gen2.htm