the.com/nine to five

The hours you trade for stability, minus the hours you'd spend enjoying it.

means A standard full-time work schedule — the conventional daytime office hours, and by extension the whole routine of salaried employment.

from Simply descriptive: 9 a.m. to 5 p.m., the stretch long treated as the default workday in offices. The phrase moved from scheduling shorthand to cultural shorthand for the grind itself, cemented in English partly by Dolly Parton's 1980 song '9 to 5,' which turned the timetable into an anthem about the monotony and indignity of clocking in for the man.

origin
Term predates Dolly Parton's 1980 anthem by decades
reality
Average commute adds unpaid hours on each side
irony
Many salaried jobs quietly stretch past the five
legacy
Standardized by labor movements demanding an eight-hour day
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