diff --git a/wideboy/scenes/default/tile_grid.py b/wideboy/scenes/default/tile_grid.py
index a199875..134e740 100644
--- a/wideboy/scenes/default/tile_grid.py
+++ b/wideboy/scenes/default/tile_grid.py
@@ -26,9 +26,9 @@ class GridCell(VerticalCollapseTileGridCell):
 def format_watts(watts: int):
     return "{:.0f}W".format(watts) if watts < 1000 else "{:.1f}kW".format(watts / 1000)
 
-def format_duration(seconds: int):
-    hours = seconds // 3600
-    minutes = seconds % 3600 // 60
+def format_minutes(minutes: int):
+    hours = minutes // 60
+    minutes = minutes % 60
     return f"{hours}:{minutes:02d}"
 
 # TILE DEFINITIONS
@@ -174,7 +174,7 @@ def open(self):
 
     @property
     def label(self):
-        return format_duration(self.value)
+        return format_minutes(self.value)
 
 class CellBatteryDischargeRemainingTime(GridCell):
     icon_codepoint = FontAwesomeIcons.ICON_FA_PLUG_CIRCLE_MINUS
@@ -190,7 +190,7 @@ def open(self):
 
     @property
     def label(self):
-        return format_duration(self.value)
+        return format_minutes(self.value)
 
 # Network Tiles