How long do your eyes need to adapt to darkness and reach full contrast? - Deepstash
How long does it take for your eyes to adjust to the darkness?

On average, it takes 30 to 45 minutes for your rods to be fully dark adapted to night vision. 

It also covers things such as Mesopic vision and Scotopic vision, eye health, and how to actually dark adapt. I suggest it as a good read.

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