In order to completely max out your EGO grid you'd have to spend 260 perk points. You get 1 perk point each time you level up. Therefore you must level up 260 times to max your EGO grid. Each time you level up you receive 10 EGO. Thus, leveling up 260 times will give you 2600 EGO.
Source: 10(260 x 1)



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