Ineligibility To Receive Hextech Loot

Hello forum,

I have a question regarding restrictions on earning Hextech loot based on player behavior. My best friend in real life was banned for negative behavior, and when the ban was lifted he realized he was banned from receiving any loot. I know this probably has been answered hundreds of times but is there any way to tell how long of a period he will have to go with good behavior to be eligible for loot again? With the release of mastery 6 and 7 (Hype!) he is pretty down about himself for what he did in the past. He has a short temper when games get heated but he has been working tremendously on improving his behavior. At the end of games when we all are receiving our key fragments he is feeling left out and I really want him to have fun again. Could a red response please clear this up to give him a shred of hope since he was never told the ban would be lifted and thinks it never will be? I tried Google. Any responses welcome and thanks in advance.