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 Color Laserjet Pro MFP M477fdw Printer

HP Color Laserjet Pro MFP M477fdw Printer

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