Ghosting entirely depends on the wiring of the keyboard pcb. Key rollover can depend on the wiring of the keyboard pcb, but usually is limited by the usb HID protocol.

Generally speaking, usb can carry up to 6 keys of information in a single packet (I don’t remember off the top of my head if modifiers are included). It is possible to use extended packets and encode more info (and thus allow for more than 6 keys rollover) but it requires negotiation with the os so most vendors don’t bother as generally you don’t need to be able to press more than 6 keys at the same time for most applications.

And it’s legal to have 24h shifts? Or 16h of overtime in a day?

Edit to add: I don’t know how it works in california, but where I’m from on-call duty is not the same as overtime, and you can’t mix the two. And there are limits to shift time (including on-call) + overtime. So even if it was legal to have 8h shifts and 16h of on-call duty (it isn’t) it wouldn’t be classified as overtime

It must be fraud because nobody can work 5000 hours a year

Your definition of full time is incorrect. Full time is 40h/week, at 52 weeks per year that’s 2080 hours per year. 3000 hours of overtime puts the total at 5080, or 19.5 hours per day.

That’s by working 5 days a week, every week, no vacation nor PTO nor sickness.

It is fraud

God is just an edgy anime protagonist

Oh bless you, stay away from c++ and rust