[TeMPOraL]

Accepted by whom?

I hate it when marketers get to make up their own meaning of commonly used words, usually making them mean less than they ordinarily do. With "all-day" meaning anything between 6.5 (see parallel comment) and 20 hours, it's becoming a worthless and purposefully confusing term.

(Note if that a physical store advertises it's open "all day", you expect it to be open from 00:00 to 23:59.)

[ogre_codes]

Well in this case you don't have to wonder what it means because they say exactly how long—18-hours.

Also, nobody says "open all day" in retail because retailers would be more explicit about the fact that they are open at night, thus you have 24 hour convenience stores, not "all day".

[mc32]

It’s no better or worse than the old “lifetime” warranty which varies from guarantor to guarantor. Oh, it means “service life,” oh it means “while original owner uses it”, etc. They are all bad. They should say what they mean and not hide behind their own definitions (which can change over time).

[victorvation]

"Accepted" by marketers, which I guess is your point. The term is meaningless