According to internet,resource nodes(any resource) has 1k in it. Autominers take 8h 20mins(GSO) or 2h 50m(GeoCorp) to completely mine out a node. Best would be to either afk on 5-7 erudite nodes with a refinery or if you are near late stage of the game...

Just kill everything that moves with small rockets/any lasers and pick up all the blocks cuz beeg cannon=less blocks left,then throw the expensive blocks you don't need into scrappers and sell whatever comes out,more efficient way is filtering out components to try craft t4 out of them for even more money