How long can it be turned on in sleep mode before I must turn it on manually to print?

How long can it be turned on in sleep mode before I must turn it on manually to print? For example, LaserJet Pro M177fw works only 8 hours and then you must turn it on physically to be able to print again. It looks like a fraud to call a printer "network printer" when user must turn it on manually every time when he wants to print!

HP Laserjet Pro MFP M477fdw All-in-One Wireless Color Printer

HP Laserjet Pro MFP M477fdw All-in-One Wireless Color Printer

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