Embarkation Time for Northern European cruise

We will be sailing on the Breakaway in Europe this summer and we have never sailed with Norwegian before. How do you know what time to arrive at the port for embarkation? I know some cruise lines give you a time in your documents but can you show up earlier? Any extra tips on the Breakaway would be awesome as well! Thanks!

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We arrived around 11am and boarded instantly with no queue this year.

If you are boarding in Copenhagen (like most of the passengers), you can board as soon as 11am. NCL uses two separate terminals to board, based on which deck your cabin is on. We were there last July on the GA and assigned to terminal 1. We arrived from our hotel at around 11 and were boarded pretty quickly.