There are those who prefer to play in the morning, when they are more alert.
On the other hand, there are those players who prefer the night as they no longer have any worries for the day and can dedicate themselves exclusively to the game.
I also understand that depending on the game chosen, some factors such as the profile of online players can make a difference.
The same goes for bonuses that are only released at predetermined times.
So I don't think there is an ideal answer to your question.
In terms of PVP gambling, as long as the site is big enough, it will always have players but if you are playing with your close friends, you may need to wait for their free time. Lastly about the bonuses, usually they have longer expirations to ensure that everyone can claim successfully.