An amusing sample of the prose: Most usability studies last from 1 to 2 hours because it's hard to recruit users to come in for longer tests. In fact, unless w

An amusing sample of the prose: Most usability studies last from 1 to 2 hours because it's hard to recruit users to come in for longer tests. In fact, unless we're testing kids — for whom an hour is the max — we usually limit our test sessions to 90 minutes. People tire after an hour or two. Wonderful stuff, as is the norm from the Nielsen Norman Group.