there are woods near my house and if you walk through them there is a river where people like to party on a summers night. The river is roughly 500+ metres from my house. On a still night, with the windows open, I can hear the people at the river. I live in a sixth floor flat, and sometimes I can't hear the people round the corner playing music unless I am on the landing. It all depends on the direction the sound is coming from.
So many factors - weather, environment (main road, traffic etc) even interior environment and, of course, personal hearing levels. All I can say is that with windows open and the environment / weather stable I can hear remarkably more during the early hours than I can in the day - but that's not to say others do.