I have a Nexus 6(Build LMY48M) with AT&T. How long do i wait for the OTA update for Marshmallow.

[AC Question]

I have a Nexus 6(Build LMY48M) with AT&T. How long do i wait for the OTA update for Marshmallow. I've read somewhere that there is a Bug Update(LMY48T) before i get Marshmallow (Shamu-MRA58K) as OTA. All in all how long do i wait to have Android 6.0 Running on my Phone.???