Not sure how long it will take will be down to carrier eg Vodafone, ee, 02 etc. That said it won't be to far away I presume ;-)
Yeh it's relatively painless and easy to flash.
1) Download Kies 3
2) Download Odin 3.09
3) Download 4.4.2 Poland firmware for SM-N9005
4) Get into download mode-Turn off phone power, home volume down- then hit volume up to get into download.
5) connect you phone to pc run odin, place the firmware in AP make sure it's ticked and also bootloader update.
6) Hit start it will flash and enjoy
Yeh sounds like a few stages but it's relatively straight forward.
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