Under ICC regulations, accumulation of six demerit points can result in a venue being banned from hosting international matches for a period of 12 months. The Test, which England won by four wickets, was completed inside two days, with as many as 20 wickets falling on the opening day alone.source https://timesofindia.indiatimes.com/sports/cricket/news/36-wickets-in-2-days-icc-rates-mcg-pitch-unsatisfactory-hands-ashes-venue-one-demerit-point/articleshow/126228461.cms