In the heaven-
Day or night, it cant be tell what time it is in the heaven as there is always day time in the heaven.
But still, gods are free to change the day into night or night into day however they wish, so getting to know what exactly the time is, it is really hard.
Xiong Bo, since he came to the heaven, he has been taking fighting lessons from the soldiers of heaven for all these times.
There is not even a single time when he took rest, he has been practicing nonstop, but for what?
For the future fight
While Xiong Bo and his god father, Thunder God, were on his there way to the heaven, Thunder God told Xiong Bo about the coming calamity that is going to destroy the whole mortal world.
The destruction will be to the point that there is a chance that the heaven might think about interfering and most probably send its own army to the mortal world.