Downloading...Do not turn off.... How long will this last? It is going on 1 hour

[AC Question]

Downloaded new Lollipop OS, now my screen is on Downloading...Do not turn off.... How long will this last? It is going on 1 hour

Galaxy Note 4. Two prior updates installed successfully. Went to restart phone and screen came up.

 

[B. Diddy]

Welcome to Android Central! You're in Download Mode, which is used when you want to manually install a ROM. If you're not connected to the computer via USB, then it's safe to power the phone down, then power it up again normally. Does it keep going into Download Mode even if you only press the Power button to turn it on normally?