The best way is to undercoat them all with spraypaint and use a single colour at a time on many models at once. Once you have applied that colour to all your minis you move on tp the next colour until you are finished.
Best tip I can give you for night lords is when you paint the gold banding, go slow, if you go to fast you will make a mistake that stands out on the blue so you have to back and paint over it, taking even longer =\. Also don't worry about details too much if your going for speed, just paint the armour, shoulder plates leg banding and the nl badge, you can probbly get one guy done every 10 minutes or so if you don't worry about detail too much.
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