Purely anecdotal: I feel like it used to mean 9-5, and somewhere in there you'd have lunch. These days I think it's more of a (misnomer) term for 8 hours of on-

Purely anecdotal: I feel like it used to mean 9-5, and somewhere in there you'd have lunch. These days I think it's more of a (misnomer) term for 8 hours of on-the-clock work, and most people are expected to go something like 8:30 - 5:30.