If I had 50 dollars I could live off that for a week.
1) If we had two hours we could watch a movie.
「2時間あったら、映画が一本見れちゃうよ。」
2) If I had 50 dollars I could live off that for a week.
「50ドルあったら、一週間暮らせるよ。」
どちらも If I had ... I could ~. を使って表現できます。
ご参考になれば幸いです!