In Canada, the regulations have been 8 hour workday with two paid 15 minute breaks in that period and an unpaid 30 minute break for salaried workers, unless otherwise agreed by contract, since I started working in the early 90s.
This means a lot of people work 9-5:30 or 8:30-5. Union jobs generally have a 8 hour day in total with a 1 hour lunch break, and other professions have other arrangements.
For a number of years, I took my “lunch break” at 5 and just worked a straight 8 hour day with two 15 minute breaks.
Signal is designed to collect meta-metadata. They don’t hold any information that can tie a person to their account, but they definitely know how those accounts interact via their servers.