diff --git a/src/uk/co/majenko/audiobookrecorder/BookTreeRenderer.java b/src/uk/co/majenko/audiobookrecorder/BookTreeRenderer.java
index dbebe0a..50b50c2 100644
--- a/src/uk/co/majenko/audiobookrecorder/BookTreeRenderer.java
+++ b/src/uk/co/majenko/audiobookrecorder/BookTreeRenderer.java
@@ -86,7 +86,7 @@ public class BookTreeRenderer extends DefaultTreeCellRenderer {
             }
 
 
-            JLabel time = new JLabelFixedWidth(75, " " + Utils.secToTime(s.getLength(), "ss.SSS") + "     ");
+            JLabel time = new JLabelFixedWidth(75, " " + Utils.secToTime(s.getStartTime(), "mm.ss.SSS") + "     ");
             time.setHorizontalAlignment(SwingConstants.RIGHT);
 
             ctx.gridx = 0;
diff --git a/src/uk/co/majenko/audiobookrecorder/Sentence.java b/src/uk/co/majenko/audiobookrecorder/Sentence.java
index 1b78881..7afcb65 100644
--- a/src/uk/co/majenko/audiobookrecorder/Sentence.java
+++ b/src/uk/co/majenko/audiobookrecorder/Sentence.java
@@ -35,6 +35,7 @@ import javax.sound.sampled.AudioSystem;
 import javax.sound.sampled.AudioFileFormat;
 import javax.swing.JOptionPane;
 import javax.swing.SwingUtilities;
+import javax.swing.tree.DefaultMutableTreeNode;
 import javax.swing.tree.TreeNode;
 import java.io.BufferedReader;
 import java.io.InputStream;
@@ -819,6 +820,23 @@ public class Sentence extends BookTreeNode implements Cacheable {
         return pos;
     }
 
+    public double getStartTime() {
+        double time = 0;
+        DefaultMutableTreeNode prev = getPreviousSibling();
+        while (prev != null) {
+            if (prev instanceof Sentence) {
+                Sentence ps = (Sentence)prev;
+                time += ps.getLength();
+                time += ps.getPostGap() / 1000d;
+                prev = prev.getPreviousSibling();
+            } else {
+                break;
+            }
+        }
+        return time;
+        
+    }
+
     /* Get the length of the sample in seconds */
     @Override
     public double getLength() {