Maybe not a day off... but atleast 12hours ;D lets say..
Day starts at 4:00 am
1st cup game at 4:00pm.. would give managers time to fix their teams.
Same thing about day 3..
Champions league game in the morning, between 6am and 4pm..
League games start at 4:00 pm and so on...

Day off can be done only if they moved both 1st & 2nd leg on day 2...
They wanna keep season of 28days, 4 weeks and start new season on sunday as the servers reach their peaks on the weekends.