Did a simple calculation to show people how difficult 600k is:

I ran the 30 stamina map at 3x, which means it costs 90 and i got roughly 4600 points.

This means that to get 600k points i need 11764 stamina which without levels or potions will require 24.5 days. The event lasts for 12

I have no slayers and i am capable of beating that final map. Those that try to start out now will have no chance at the map and most likely will not have any slayers either.

Getting a 100% increase slayer would halve the amount of stamina needed in total which would put the 600k within reach in the days we have.