この合意書はいつまで有効か？
The Parties hereby agree as follows:

1. [Party A] will [insert specific obligation or service].

2. [Party B] will [insert specific obligation or service].

3. This Agreement will remain in effect until [insert date or condition of termination].
この合意書は、[終了日付または終了条件を挿入する]まで有効です。