Update README.md

README.md

@@ -46,7 +46,7 @@ Since this model was trained on mostly broadcast speech and texts from the web,
 ## Training data
 Acoustic training data:
 
-| Type                  | Amount |
+| Type                  | Amount (h) |
 |-----------------------|:------:|
 | Broadcast speech      |   591  |
 | Spontaneous speech    |   53   |