The fundamental difference between these 2 types of probation is that formal probation is imposed for felony offenses. Summary probation is imposed for misdemeanor offenses. Felony offenses are those that carry a state prison term of over 1 year. Misdemeanor offenses are those that carry up to 1 year of jail time. The fallout from this simple difference is significant. New changes in California law have meant that summary probation generally lasts for 1 year. Probation after a felony conviction can last 2 years or longer. The terms and conditions of summary probation are relatively lenient, as well.