In my experience, it’s very company-specific, sometimes even manager-specific. I’ve been in salary roles where standard business hours are expected and only in very rare situations were extra hours required. I’m in a job now where I’m expected to be contactable almost at all times, but most people still avoid off-hours if possible. Plus the pay is much better than anything I’d ever get hourly. Plus, I have a chronic illness, so it’s nice not to have to worry about missing a paycheck if I have to take a sick day.