Originally Posted by
fumje
Yes, this is standard for many airlines around the world.
During my mileage run days, I got to airports too early and had to wait for checkin counter to open, for example, HGH-HKG on CX, PVG-EWR/ORD/SFO on United. I needed a hard-copy boarding pass to go through immigration in those airports.
United website lists the minimum time for checkin for different airports. But OP was looking for the maximum time.