As for the Time Travel thing, Whis himself said he can't spam that technique. SSJGSJJ Vegito, with 4225% of Whis power and without the draw back of the time limit constraints would be able to endure and beating Whis tries to pull. Now, at THAT level of power, a Fusion dance would make them 8.45 times stronger than Whis, 845% of his strength, but Whis would still be able to win based on Feats and that Time Limit constraint. With a base SSJG multiplier of 6.5 shown in BOG, that would bring both of them together up to 84.5% of Whis power, not fused. As we have learned many times, though, collective power is irrelevant when the Big Bad is much stronger than the two components, even if they were to add up to more than the Big Bad, so I will keep going. 13% of Whis together as individual power. The reason I am favoring SSJ God SS Vegito is because 6.6 percent of Whis. Whis started this fight and intends to kill Goku and Vegita, who are both in SSJGSS Whis also said that he was always aware of his surroundings, and yet he stepped in poo. The battle begins on Beerus' planet, and Beerus MAY choose to jump in and assist Whis.
![super saiyan god vegito super saiyan god vegito](https://i.imgur.com/V6RrweN.png)
If they use a fusion dance at any time, they will get the A+Bx10 boost, which I believe is canon. Note, part of this battle is them GETTING the earrings by any means possible. So let's use Goku and Vegita each at base power level 100 for this and disregard scouter levels. Therefore, I will only use that which is known in this scenario the time restriction is no longer a concern, but the multiplier is no less than 6.5. Since we do not have a multiplier for Super Saiyan God Super Saiyan, if there is one (it is speculated, though not confirmed to my knowledge, that this is just a term for an SSJG who has mastered control of their form). Using math, we can argue that Goku alone as a Super Saiyan God was not-at-but-near 70% of Beerus' power level (let's say 65%) which is a 6.5 base multiplier. We will use the A+B*50 argument for the Potara, as that is the lowest rating I can find for Potara fusion. Therefore, if Goku and Vegita are 10% of Beerus' power level, they would be 6.66% of Whis each. Whis is 50% stronger than Beerus in this scenario, according to Akira Toriyama's statements in this Q&A.
![super saiyan god vegito super saiyan god vegito](https://i.pinimg.com/originals/77/7e/24/777e2457e4ffce65343394d835870874.png)
![super saiyan god vegito super saiyan god vegito](https://www.ociostock.com/productos/imagenes/img_213561_7f6652cc20df8ae386ad02b644a29bb1_20.jpg)
Vegita and Goku are roughly 10% of Beerus' power level at the time of their fights with Beerus during Dragon Ball Super. The characters are based on what we know based on what was seen in canon manga/anime (BOG, Revival of F, Dragon Ball Super, etc.) and WOG (word of god, A.K.A.