How far away can you hear a helicopter?

[TrailerParkJawa]

I can't speak to helicopters but San Jose airport is three or four miles from my house. Under certain conditions, I can hear the aircraft bring their engines online as they sit on the tarmack in the morning. Once in a while late at night I can hear the C-130s at Moffet taxing on the runway which is maybe 8-10 miles.