Some criminal cases can last for years, while others are over within weeks. The length of the criminal defense process depends on many different factors: the circumstances of the crime, the strength of the prosecution’s case, and the possibility of appeals all play a role.ou deserve an attorney who is thorough and will see your case through from start to finish. Many people who are facing criminal charges have found such a lawyer at the Law Offices of Mark T. Lassiter. Tell a committed, tenacious Dallas criminal defense attorney about your case today by calling 214-845-7007.