Set the game mode on amateur setting and the half time to 2 minutes. Quit if you are about to lose a game (or about to not continue in group stage). It should make each Champions League last less than an hour. If you're good, you can finish each Champions League in 45 minutes.
Edit: Realized that I typed "your" instead of "you're" 9 years ago. Decided now was as good of a time as ever to fix it.