diff --git a/ISCamRecorder/Setting.Designer.cs b/ISCamRecorder/Setting.Designer.cs
index 3d0ef0a..e025f76 100644
--- a/ISCamRecorder/Setting.Designer.cs
+++ b/ISCamRecorder/Setting.Designer.cs
@@ -175,6 +175,7 @@
             this.TxtRecodingDulation.TabIndex = 27;
             this.TxtRecodingDulation.Text = "30";
             this.TxtRecodingDulation.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
+            this.TxtRecodingDulation.TextChanged += new System.EventHandler(this.TxtRecodingDulation_TextChanged);
             this.TxtRecodingDulation.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.NumberKeyOnly);
             // 
             // LblRecodingMemory
diff --git a/ISCamRecorder/Setting.cs b/ISCamRecorder/Setting.cs
index ca106b6..45b8c87 100644
--- a/ISCamRecorder/Setting.cs
+++ b/ISCamRecorder/Setting.cs
@@ -57,7 +57,7 @@
             var availableMemory = (int)(info.AvailablePhysicalMemory / bcs); //利用可能な物理メモリ
             LblAvailableMemory.Text = $"利用可能メモリー:{availableMemory.ToString("#,0").PadLeft(7)}MB";
 
-            var totalConsumedMemory = (int)(TotalConsumedMemoryPerSecond * RecodingLimit);
+            var totalConsumedMemory = (int)(TotalConsumedMemoryPerSecond * float.Parse(TxtRecodingDulation.Text));
             LblRecodingMemory.Text = $"最大消費メモリー:{totalConsumedMemory.ToString("#,0").PadLeft(7)}MB";
             if (totalConsumedMemory > availableMemory) LblRecodingMemory.ForeColor = Color.Red;
             else LblRecodingMemory.ForeColor = Color.Black;
@@ -101,5 +101,14 @@
                 e.Handled = true;
             }
         }
+
+        /// <summary>
+        /// 記録時間上限書き換え時
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void TxtRecodingDulation_TextChanged(object sender, EventArgs e) {
+            this.UpdateMemoryInfo();
+        }
     }
 }