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Steam keeps one LastPlayed per title, so the hour-of-day histogram holds one sample per *title* — at the hour it was last closed, over the whole life of the library. It was labelled and reported as a launch histogram, and the module header claimed a library of eighty games is "eighty samples of what hour this person launches a game at — a real distribution". It is not. The bias has a direction, and everything pushes the same way: a title played once years ago weighs exactly as much as a daily driver, a daily driver contributes one sample ever, and an afternoon spent installing and trying a dozen games stamps a dozen titles with that afternoon's hour. So the metric over-weights trying and under-weights playing. On the production host it reads n=331 with 329 titles no longer installed; on this dev machine, 28 titles spanning 570 days. Corrected rather than disclaimed, because the direction is knowable: - Fields say what they hold — last_played_hours, titles_sampled, and no "launch" anywhere. The display says "when you last played each game — 28 titles, local time, reaching back 19 months". - A second histogram over titles played in the last 30 days, which is one sample per title still in use, and the peak window prefers it when it has the samples to claim a shape. - Which histogram the peak came from is stated in the output and on the wire (peaksrc=30d|all), and the summary line carries the sample count the window was actually computed from, so a narrow peak drawn from nine titles cannot borrow the authority of three hundred. - New keys hours30, n30, nspan, playh. hours/n/peak keep their names and meaning so the corpus stays continuous; submissions without peaksrc are whole-library by construction. Playtime is read and reported but deliberately not used as a weight: it is a lifetime total against a single timestamp, so weighting by it would multiply one arbitrary hour by five hundred. Five tests, including the wrapping midnight window, which is the case a non-wrapping scan gets wrong and exactly the evening peak 0017 is about.