diff --git a/fishbook/frontend/util.py b/fishbook/frontend/util.py
index 8e33e52..e9a9f88 100644
--- a/fishbook/frontend/util.py
+++ b/fishbook/frontend/util.py
@@ -200,24 +200,27 @@ class StimSpikesFile:
         
         index_map = {}
         trial_data = []
+        trial_duration = 0.0
         index = 0
         trial = 0
             
         for l in lines:
             l = l.strip()
+            if "duration:" in l:
+                trial_duration = float(l[1:].strip().split(":")[-3])
             if "index:" in l:
                 if len(trial_data) > 0:
-                    index_map[(index, trial)] = trial_data
+                    index_map[(index, trial)] = (trial_duration, trial_data)
                     trial_data = []
                 index = int(l[1:].strip().split(":")[-1])
             if "trial:" in l:
                 if len(trial_data) > 0:
-                    index_map[(index, trial)] = trial_data
+                    index_map[(index, trial)] = (trial_duration, trial_data)
                     trial_data = []
                 trial = int(l[1:].strip().split(":")[-1])
             if len(l) > 0 and "#" not in l:
                 trial_data.append(float(l)/1000)
-        
+        index_map[(index, trial)] = (trial_duration, trial_data)
         return index_map
 
     def get(self, run_index, trial_index):