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The description for it is: "Maintain 70 or over charge for 60 seconds", but I'm not sure if it has to be continuous or a total of 60 seconds
It must be 60 seconds continuous. If you drop below 70, the timer is reset.
Pixel sprays are used to reward a difficult achievement with a specific action on a specific character, having a total of 60 seconds over 70 charge is fairly easy in the long term.
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