I know that supposedly if you don't craft/make something at least every 17 hours your proficiency actually goes down. Now here's what I want to make sure. How does it work?
1. Your mastery goes to 0 if you go past 17 hours without making something?
2. Your mastery decays in chunks over time, meaning that you're not entirely screwed over by overly long Sever Checks/Maintenance/Updates? If it's this case, how much does it decay per day?