if (Input.GetMouseButton(0)) { Debug.Log("Click"); } https://qiita.com/yando/items/c406690c9ad87ecfc8e5

// Time.time > 1.5f の場合に1回だけHoge()を実行 if (Input.GetMouseButton(0)) { if (iscalled == false) { iscalled = true; Hoge(); } }