How many years does a lieutenant governor have?

A quote from the constitution of North Carolina: "The...Lieutenant Governor shall be elected...every four years" "Their term of office shall be four years and shall commence on the first day of January next after their election and continue until their successors are elected and qualified."

Hope that helps.

Reference:

The constitution of North Carolina, Article III: http://www.ncga.state.nc.us/Legislation/constitution/article3.html