Expat health insurance has a maximum term limit of five years. This five-year term starts on the first day you arrive in Germany.
For example, if you moved to Germany on the 1st of January 2020 but signed up for Expat Insurance on the 2nd of June 2021, you can only remain on the policy until the 1st of January 2025.
If you would like to learn more about expat health insurance or would like to sign up, you can do so here.