I often play CS:GO after long hiatus's due to work and school, and most of the time, when I come back, my ranking has become "unranked", and displays the message "You need to win 1 more game to show your ranking".
My question is how long it takes for these skill groups to expire? I used to be a DMG, then stopped playing for 6 months, then came back, found I was unranked, won 1 match, and became double AKs. Then I stopped playing for another 4 months, came back, was unranked, won 1 match, and became GN3. I have recently come back after 3.5 months in hiatus, and have found out I am unranked. I really do not like trying to win 1 match just to see my rank go lower and lower, so I ask how long does it take for these skill groups to expire, so I will not have to worry about losing my rank.