Did you check QA website? At least until last summer, QA normally provided hotel for free if you have a long layover. The only occasion I heard one of my friends did not get hotel was because he got his ticket through a travel agency that got "special fare(or something similar)"  ticket. He had to argue with few QA people to find out the reason. Other Nepali passengers in the same itinerary got hotel, he did not. If you got your ticket online through QA website, you are good.