By Michael Lanza
Our long day of hiking began at 6 a.m., shortly after first light, under a gray overcast that would rain intermittent light showers on us over the next several hours and, at times, envelop us in pea-soup fog. When our day ended 15 hours and 59 minutes later—we could officially call it “sub-16 hours”—two friends and I had proven to ourselves (and no one else would care) that, in our 50s, we could still tick off the 32-mile, 10,000-vertical-foot, nine-summit Pemi Loop in New Hampshire’s White Mountains in one long, grueling day.