I've just taken apart my lightest hardtail which was just over 22lbs. It rode better than I was expecting (didn't get pinged about all that much) but I have more fun on the other bikes so there was just no need for it. My current hardtails are a 25lb 80mm travel Zion (actually a tad heavier than my Epic) and my Soul, which is just shy of 29lbs at the moment:

The Soul can (and has) been built up a fair bit lighter without make it any less fun so that's my next project as the other bikes are pretty sorted now. I doubt it'll get under 26-27lbs though.