If you are restricted from Hextech Crafting read this
There is no specific timetable for lowering your punishment tier. You must play games and not have valid reports filed against you frequently in order to regain the punitive system's trust. This is not a new system you have always been on a watch-list of sorts for a while after you are punished and the system slowly decides if you are reformed or not by judging your games played vs valid reports received. You are only now facing consequences of a system that has always been in place.
The onus is on you to prove to riot that you deserve free loot, so get out there and play some good games and you'll be looting like the rest of us in no time.
Source: RiotNeuroCat on Punishment Tiers (Via reddit.com)
{quoted} Hijacking the top comment here.
We're working on putting out a better explanation for this. For players that are punished by the Instant Feedback system and work off the punishment, they will still be restricted from earning Hextech chests or keys for a period while the system ensures that they have reformed their behavior. There is no fixed interval here - if you continue to play with sportsmanlike behavior, you'll eventually get back into good standing. We're looking into making a player's status more clear/visible to help avoid this kind of confusion.
Thanks for taking the time to read this instead of making another thread asking why you can't loot chests right now. It makes life easier for all of us on the PB&M board.