Add workaround for missing cleaning time in roomba (#51163)

homeassistant/components/roomba/irobot_base.py

@@ -23,6 +23,7 @@ from homeassistant.components.vacuum import (
 )
 import homeassistant.helpers.device_registry as dr
 from homeassistant.helpers.entity import Entity
+import homeassistant.util.dt as dt_util
 
 from . import roomba_reported_state
 from .const import DOMAIN
@@ -191,14 +192,10 @@ class IRobotVacuum(IRobotEntity, StateVacuumEntity):
         # currently on
         if self.state == STATE_CLEANING:
             # Get clean mission status
-            mission_state = state.get("cleanMissionStatus", {})
-            cleaning_time = mission_state.get("mssnM")
-            cleaned_area = mission_state.get("sqft")  # Imperial
-            # Convert to m2 if the unit_system is set to metric
-            if cleaned_area and self.hass.config.units.is_metric:
-                cleaned_area = round(cleaned_area * 0.0929)
-            state_attrs[ATTR_CLEANING_TIME] = cleaning_time
-            state_attrs[ATTR_CLEANED_AREA] = cleaned_area
+            (
+                state_attrs[ATTR_CLEANING_TIME],
+                state_attrs[ATTR_CLEANED_AREA],
+            ) = self.get_cleaning_status(state)
 
         # Error
         if self.vacuum.error_code != 0:
@@ -219,6 +216,25 @@ class IRobotVacuum(IRobotEntity, StateVacuumEntity):
 
         return state_attrs
 
+    def get_cleaning_status(self, state) -> tuple[int, int]:
+        """Return the cleaning time and cleaned area from the device."""
+        if not (mission_state := state.get("cleanMissionStatus")):
+            return (0, 0)
+
+        if cleaning_time := mission_state.get("mssnM", 0):
+            pass
+        elif start_time := mission_state.get("mssnStrtTm"):
+            now = dt_util.as_timestamp(dt_util.utcnow())
+            if now > start_time:
+                cleaning_time = (now - start_time) // 60
+
+        if cleaned_area := mission_state.get("sqft", 0):  # Imperial
+            # Convert to m2 if the unit_system is set to metric
+            if self.hass.config.units.is_metric:
+                cleaned_area = round(cleaned_area * 0.0929)
+
+        return (cleaning_time, cleaned_area)
+
     def on_message(self, json_data):
         """Update state on message change."""
         state = json_data.get("state", {}).get("reported", {})