https://www.senate.gov/reference/reference_index_subjects/Senators_vrd.htm

A senator's term of office is six years and approximately one-third of the total membership of the Senate is elected every two years. Contacting Your Senator.

https://www.senate.gov/senators/qualifications_termsofservice.htm

Senators are elected to six-year terms, and every two years the members of one ... The Constitution does not provide an oath of office for members of Congress, ...

https://ballotpedia.org/Length_of_terms_of_state_senators

Senators in 31 states have a four-year term. Senators in 12 states have a two- year term. Senators in seven states (Arkansas, Delaware, Florida, Illinois, ...

https://walberg.house.gov/about/how-congress-works

What are the qualifications to run for office in the House of Representatives and Senate? ... How long do members of Congress' terms last? ... Senators however, serve six-year terms and elections to the Senate are staggered over even years ...

https://en.wikipedia.org/wiki/Term_limits_in_the_United_States

Term limits in the United States apply to many offices at both the federal and state level, and .... might arise to American freedom by continuing too long in office the members of the Continental Congress". .... Thornton, 514 U.S. 779 (1995), that states cannot impose term limits upon their federal Representatives or Senators.

https://en.wikipedia.org/wiki/Seniority_in_the_United_States_Senate

United States senators are conventionally ranked by the length of their tenure in the Senate. The senator in each U.S. state with the longer time in office is known as the ... The seniority date for an appointed senator is usually the date of the appointment, although the actual term does not begin until they take the oath of office.

https://en.wikipedia.org/wiki/United_States_Senate

The United States Senate is the upper chamber of the United States Congress, which along .... Senators serve terms of six years each; the terms are staggered so that approximately one-third of the seats are up for election every two years. ... A senator elected in a special election takes office as soon as possible after the ...

https://www.quora.com/What-is-the-length-of-a-US-Senators-term-and-how-many-terms-can-one-serve

U.S. Senators serve 6-year terms, and can serve unlimited number of terms. Senatorial elections are held every two years, with 33 or 34 seats ...

https://www.senate.ca.gov/faq

Committees, Offices & Caucuses ... How long is a Senate term? The Senate has a membership of 40 Senators elected for 4-year terms, 20 to begin every 2 years  ...

http://www.let.rug.nl/usa/documents/1786-1800/the-anti-federalist-papers/length-of-term-in-office-for-senators-(june-26).php

Length of Term in Office for Senators (June 26). MR. MADISON: In order to judge of the form to be given to this institution, it will be proper to take a view of the ...