how much times should reward player in one day,when i use the rewarded video

Unity Services
1

how much times should reward player in one day,when i use the rewarded video
once or unlimited?
can this improve **eCPM,**if i unlimited show rewarded video?

2

I recommend reading our best practices guide. Rule of thumb: make the players want to watch the ads to get rewarded.

https://unityads.unity3d.com/help/monetization/best-practices