Hope you are having a great time party peoples.
So you might have noticed that you are receiving less DEC/battle after you are battling for a longer time. The reason for this is the Energy Capture Rate (ECR).
For each battle, you lose 1% of the remaining ECR. Since you are capped at 100% you always want to stay below it, to avoid wasting regeneration time. You have to keep in mind that each hour you regenerate 1.04 % or 25% every 24 hours. So for example you are sleeping for 8 h, then I would play 9 games to reach around 92 %.
However, I wouldn't exaggerate and probably stay at an ECR above 75%. Below 70 % playing isn't that rewarding. Fighting at 50% ECR means you get half the amount of DEC for playing your matches, compared to when your ECR is full.
Personally, I like to split my daily 20 - 25 matches throughout the day, because in my opinion, it's getting quite exhausting when I have to play for a long time consistently.
I hope this post could help you and if you ever wondered why you earn less DEC in the evening here is the reason.
Cheers,
luckygamer