Hey everyone, i just found this out during my mining leveling.
So yea, i was kinda bored of the spawns in 1k Needles so i thought - What will happend if i leave the node and come back later?
It was late at night on a dead server so no one was touching my nodes so when i came back to the node after compleeting my route i could skill up again
Conclusion : You can skill up several time in one node.
Now, it seems you can only skill up on the same node if u leave it for some time, i dont know if its time counting or distance but meh
Now go go flamers!