I've been looking into the benefits of white/ambient noise on studying lately, and I think it's best to put on some cafe, busy library, study place ambient noise (with people talking in the background). I've been looking for audio tracks of this kind. So far I've found some that are simply "sound effects", which last < 1 minute. But what I really want is an audio track that plays for several hours with no looping.
I've searched several places but haven't found anything like that.
Is there some open data collection of ambient background noise that I described?