Some regulatory authorities, but not all, won't specify a cut-off time for drinking, only that it is an offence to report for duty when unfit due to alcohol or drug consumption, so a real bender at lunchtime can still leave you unfit for most of the following day. Companies can/do give a cut-off time for drinking in their OM, eight to twelve hours seems the most common and even if no state, federal or country laws are broken, (so no prosecution), an individual can still be dismissed for breaching the company OM.
India is one country that has a countrywide law forbidding drink within twelve hours of reporting for duty and I remember a case where the hotel were asked to produce the room service receipts to establish just what time last drinks were ordered. Moral of that story is pay cash and tip well!