"normally you can cancel a friendly with even 1 minute to go"
There's no normally comrade, even when I was online many times you can only wait for the match to start to make 6 or 7 changes and delete the guy from your friends list, especially if u have matches later that day... If they schedule 2 matches, 1 in 3 minutes and another later you can cancel the 2nd one...
That's my experience of it
Anyways new season is up, already got me 3 lvl39 players good luck all