Updated to 4.2.2 yesterday. Tried to do it thru KIES downloaded in 1hr 40 mins while installing it gave an error after waiting for about 45 mins I disconnected the USB cable. Had to remove the battery to switch off. After restarting the phone (I was surprised it did), I downloaded the update via WiFi it took only 43 mins & another 14 mins to install. After the main update of 488.67MB the second update 7.82MB & the third was of 67. Something MB. After downloading the file via wifi, it then offers you the option of installing immediately or do it later (which you can schedule)
The 2nd & 3rd were called stability patches. I haven’t explored the phone just now, will do it later. Seems ok as of now.