diff --git a/tailbone/grids/core.py b/tailbone/grids/core.py
index 8a3393c8..dce57d73 100644
--- a/tailbone/grids/core.py
+++ b/tailbone/grids/core.py
@@ -225,6 +225,8 @@ class Grid(object):
             self.set_renderer(key, self.render_quantity)
         elif type_ == 'duration':
             self.set_renderer(key, self.render_duration)
+        elif type_ == 'duration_hours':
+            self.set_renderer(key, self.render_duration_hours)
         else:
             raise ValueError("Unsupported type for column '{}': {}".format(key, type_))
 
@@ -302,6 +304,12 @@ class Grid(object):
             return ""
         return pretty_hours(datetime.timedelta(seconds=value))
 
+    def render_duration_hours(self, obj, field):
+        value = self.obtain_value(obj, field)
+        if value is None:
+            return ""
+        return pretty_hours(hours=value)
+
     def set_url(self, url):
         self.url = url