Salesforce's Chief People Officer Brent Hyde declared "the 9-to-5 workday is dead
Now it is always on, always expected to read emails within seconds of delivery, take calls all day and night. Nope. Been there, done that, was not healthy for me.
Snark aside, even in my company 9-5 (well... more like 8-4:30) died a while ago. Most teams are required to have somebody to contact within "core business hours", apart from that we are more or less free, with certein limits: Don't start before 6am, don't work past 9pm (Sat: 6am-1pm), though you might required to work then if in a technical role, e.g. when we have to roll out bigger updates / maintenance of core equipment etc. (but that's a different story).