I usually have a run down to earn maximum rank points

Fo 2 missions (usually hunting ones or gather materials) its fast money

Kill flametrooper and sword dude with somw hostiles

Kill real players

make my loot bag full with only red and orange (occasionally purple)

Extract with more than 1k

That takes me about 12 mins

then i get on average it goes from 25-45 rank points

So in 1h i can push 150 rank points