Can a person have Delirium Tremors after 12 days from the time they stopped drinking?

They can. Withdrawal symptoms of alcohol can last a couple of months (some of it is due to sugar withdrawal; alcohol contains a lot of sugar and suddenly not consuming that amount of sugar can create some odd side-effects on the body). However liver damage can also cause tremors, so if they get worse or goes on for too long, get it checked out. (Particularly if a raised temperature is also involved).