That is what they /say/ isn't it, but what they actually want is the thought of someone being "full time" as if they can use that person 24/7 by paying for them

That is what they /say/ isn't it, but what they actually want is the thought of someone being "full time" as if they can use that person 24/7 by paying for them "full time". They're misunderstanding the meaning of the phrase. Real //coverage// requires shifts of multiple people for the same job. "Being reachable", used to involve special extra pay just for the option of being called in (actual pay).