Until they lose an election. Most of the time they remain in office far too long.
Yes.
If I understand the question correctly, you're asking whether there are term limits for US Senators. If so, the answer is no--Senators can continue to serve as long as they continue to be reelected.
There are no term limits for senators.
Senators of the US Congress are elected for 6 year terms. Then they can be reelected or not, depending upon the outcome of the election.
every 4 or 2 years
US Senators would like that system, but they have to take their chances.
Richard Blumenthal is the senior U.S. Senators from Connecticut. He is a member of the Democratic Party. Richard Blumenthal was elected in 2010 and reelected in 2016.
The term of office for US Senators is six years; there are no term limits. A Senator may serve as long as the voters of his (or her) state continue electing him, provided he is not removed from office for misconduct.
The U.S. Senators from Connecticut are Richard Blumenthal and Christopher Murphy. They are members of the Democratic Party. Richard Blumenthal was elected in 2010 and reelected in 2016. Christopher Murphy was elected in 2012.
4 years
Do you mean US Senators? The US Constitution sets the number of Seneators at two per state. Alabama, just like the other 49 states, elects two Senators to the US Senate. The State of Alabama has a state legislature as well, with both a House of Representatives and a Senate. The Alabama State Senate has a total of 35 members.
6 years. They can be reelected as many times as they want.