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The power is doubled every ten seconds. That's the very first explanation about it in the series after Raynare mistook it for a Twice Critical - which doubles power only once. She even gave an example to Issei using power levels. Her power level is 1000, Issei's power level starts at 1. If he doubles his power once, his power level merely increases to two. The power difference between them would still be insurmountable, which is why she was mocking him and the supposed Twice Critical he had.GyroNutz said:It's not treated like a 2x exponential boost in the series, at least not when they're fighting.