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About one-third of the Senators in Congress are elected every two years. This means the 33 are up for election at any one time.
Senators have 6-year terms. There are Senate elections every 2 years (the even years) where about 1/3 of the Senate is up for election. The Senators from the same state are never up for election at the same time. But during any 6 year period, both of your Senate seats will be up for election.