how many protector to farm in 2nd run

did my first time machine, in my 2nd run currently. devour lvl 56. how many protectors should I farm is normal in 2nd run?

I farmed 3, the 4th one is 3.5 million hp.... idk how long it gonna take....

but the trader is selling those single pile cube. if I don't farm protector and try to get some cube,it gonna take a good amount storage spaces..