I'm a big led lenser fan. I have a p7 and a m7, both are the same but the m7 has a micro processor in it which allows you to use a number of settings.( the defensive strobe light on it actually blinded me for about a minute. I guess that's where it's name is from.) I also have a p14 which is the same as the p7 but bigger. I also have a h14r head torch which is brilliant! As for timings on how they last i would agree with Sapper on the p7, the p14 that's also the same as the p7. The m7 doesn't quite last as long but still lasts long enough.
Cheers Dave