I checked in the user's manual of my 6P and G2s : no such a thing.
And I could not find anything about bulb life expectancy on SF web site.

So I send a mail to Surefire technical support :
I know LED lifetime is expressed in thousands of hours, but what is the expected lifetime for a Xenon bulb assy (let's say a P60) ??
Here is their reply :
The lifetime of a P60 bulb is minimum of 30 hours .

It looks like the SF manual you mentioned is really badly formulated (?) ....