Allow drawing once every day

The duration between two draws is controlled by settings.DRAW_TIME

wordchallenge/settings.py

@@ -101,3 +101,5 @@ USE_TZ = True
 # https://docs.djangoproject.com/en/1.8/howto/static-files/
 
 STATIC_URL = '/static/'
+
+DRAW_TIME = '1 00:00:00'