Previous season i have 4 matches per day too.
Not every day. Several times during the season. And so - on the average 3 matches a day.
For example - early in the morning (1-3 AM) matches of a Champions League, 2 matches of league (15-20 PM) and a match of a cup (22-24 PM). And so, on the average 3 matches a day.

I looked at the group stage of a Champions League (on my "server"):
3 team from Italy, Spain and Turkey
2 team from Russia, Ukrane, Serbia, Netherlands
1 team from Somali, Romania, England, Saudi Arabia, Malaysia, Bulgaria, Poland, Peru, Azerbaijan, Thailand, Vietnam, Cyprus, Singapore, Egypt
The part of the teams highlighted in bold type most likely won't get to a final stage.
Europa League?