Use constant for game length

Author: trickeydan

sbot/robot.py

@@ -27,6 +27,8 @@
 
 LOGGER = logging.getLogger(__name__)
 
+GAME_LENGTH = 180
+
 T = TypeVar("T", bound=Board)
 
 
@@ -148,4 +150,4 @@ def wait_start(self) -> None:
         LOGGER.info("Start button pressed.")
 
         if self.is_competition:
-            kill_after_delay(180)
+            kill_after_delay(GAME_LENGTH)