1. 1 hour
   
2. 1 day
   
3. 2 days
   
4. 4 days
   
5. 8 days
   
6. 16 days
   
7. 32 days

100 previous games are taken into account (was 50 before)

UPD: changed bans again on May 15

Check it out https://l4d2center.com/rules/en.html
What's new:

• Knowing basic English gameplay terminology is now mandatory
  
• Sharing accounts with friends is now officially banned
  
• Lagging midgame too much is now officially banned

Those are correct regions, not necessarily the ones players picked manually
Only ranked players are calculated

• 66.38% - South America, North
  
• 6.08% - Europe
  
• 4.54% - North America, East
  
• 4.22% - South America, South
  
• 4.16% - Russia, West
  
• 4.06% - Central America
  
• 3.04% - North America, Central
  
• 2.56% - North America, West
  
• 1.17% - China
  
• 0.96% - Asia, West
  
• 0.85% - Russia, Siberia
  
• 0.57% - Asia, East
  
• 0.48% - Asia, South-East
  
• 0.27% - South America, East
  
• 0.21% - Russia, East
  
• 0.21% - Asia, South-West
  
• 0.16% - Australia
  
• 0.05% - Asia, South

The map can be checked here https://l4d2center.com/location/

those who struggles to install custom maps on l4d2center
https://www.youtube.com/watch?v=ocUOpa7x7qI

You shouldn't be able to pass tank to a different player now. Even if you leave, you will get tank control back after you reconnect.
Let me know if you find any bugs