From an inside perspective...do most employees go home at a reasonable time/have a set schedule. A friend of mine who took a job with the government mentioned that salary-wise she wouldn’t make what she could in the private sector, but she’d be guaranteed her lunch hour and leave at 5:00 every day.
This article talks about monetary and salary benefits only, but not about total hours worked to get there.
Agencies have discretion in setting hours of work, schedules etc. so long as hey comply with employment law. Lot of agencies now use flextime, remote work sites etc. just as in the private sector.