The audience’s schedule shapes the platform’s rhythm
LinkedIn is used differently than a platform people check throughout their whole day. Most activity clusters around when people are thinking about work, which in practice means weekday mornings and the middle of the day see more real attention than evenings or weekends for most professional audiences.
Your own audience still decides the real answer
A general pattern about weekday activity is a starting point, not a guarantee for your audience. A niche with different working hours, a global audience across time zones, or a community with unusual habits can shift the answer away from the generic one. Checking your own post history for what has landed well is more reliable than following a rule that assumes an average professional schedule.
Consistency of a posting day matters as much as the hour
On a platform where people check in with some regularity around their work routine, a predictable posting day can matter as much as the exact hour within it. The audience learns roughly when to expect something.