Your BRAVIA TV can receive new software/ firmware automatically from the Internet or with a Digital TV-signal (Cable or Terrestrial).
Receiving software/ firmware with a Digital TV- signal takes up to 36 hours to download.
Software download time from the Internet can be over 30 minutes depending on Internet connection speed and the file size of the software/ firmware update.
The automatic software/ firmware download from Internet will usually start in next 24 to 36 hours after the new software/ firmware is uploaded to the server. The TV negotiates with a server when the update will download. Please check for more info on how to receive an automatic software update to TV.