Senators in 12 states have a two-year term. 6 years is the length of the term of a US Senator. Also, like Assembly Members, Senators who were first elected to the State Legislature on or after the passage of Proposition 28 may serve 12 years in the Senate, or a combination of service in the Assembly and Senate as long as the combined terms do not exceed 12 years. Senators in 31 states have a four-year term. There are no restrictions on the number of times a senator may be re-elected. A person elected to the US Senate is called a US Senator. The length of terms in state senates in the 50 American state senates is either two years or four years. The length of a term of office for members of the United States Senate is six years. The California State Assembly members are limited to three terms (6 years) since 1996. Length of terms of state senators. These term limits are lifetime, not consecutive. The Senate has a membership of 40 Senators elected for 4-year terms, 20 to begin every 2 years. How long is a Senate term? The Governor can serve two terms of four years, with a limit of two terms. A "state senator" is one elected to the upper chamber of a state legislature. As of December 13, 2018, the number of states with legislative term limits is … During his or her lifetime a person may serve no more than 12 years in the Senate, Assembly, or both, in any combination of terms. The State Senate members are limited to two terms (8 years) since 1998.