Why Kefura didnt defuse after releasing so much power?

2017-11-19 04:13:36

In the "Future Trunk" arc of Dragon Ball Super, Vegito didnt last an hour fused because he had so much power he consumed all the energy to stay together. But now we've seen Kefura released a huge amount of power, probably close to Goku Ultra Instinct, and probably over Super Saiyan Blue Kaioken since we've seen her having an even match with Goku in that state and now she turned into super saiyan 2 meaning she multiplied that power by 2. Then why Kefura didnt defuse after releasing so much power?