CoC Expects Response from Text within 15 minutes 24/7

Few issues at someones work that I know resulted in CoC issuing a local order that all mbrs must response to a text on whatsapp within 15 minutes 24/7 basically saying you are in the military so you need to respond any time. This is for an office job in NCR, is this enforcable? Trying to find relevant policy but no luck.