Do you get a free hotel if your layover is long?

Excuse me, could you please clarify something for me? I was wondering, if I were to have a lengthy layover at an airport, would I be entitled to a complimentary hotel stay as part of my travel arrangements? I'm particularly interested in knowing if such a benefit is a standard practice or if it varies depending on the airline, airport, or perhaps the length of the layover itself. I'd appreciate any insight you could provide on this matter.