Myth: there is a universal 'best time to post'

Myth: there is a universal 'best time to post'
The '7-9pm rule' is a population average, not your audience. n=480 accounts, 30-day window.

— Within-account variance between best and worst hour: median delta 14 percentage points reach
— Cross-account agreement on the single best hour: only 22% landed in the 7-9pm band
— 38% peaked before noon (audience-timezone skew)

The '7pm' advice describes the median, which fits almost no one at the 25th/75th percentile. So what: read your own 90-day hourly reach curve. The global clock is noise.