The 501M circular shuttle service operates clockwise from approximately 5:45 am to 1:45 am every day. There is no overnight service on this shuttle route.
The scheduled times for the 501M buses are available for specific stops on the TTC.ca site.
The stop at Queensway and Windermere is http://www.ttc.ca/Schedule/schedule.jsp?Route=501W&Stop=e.b._on_The_Queensway_at_Windermere_Ave.
And the stop on Marine Parade (east leg) at Lake Shore Blvd is http://www.ttc.ca/Schedule/schedule.jsp?Route=501E&Stop=s.b._on_Marine_Parade_Dr_%28East%29_at_Lake_Shore_Blvd_West.
TTC Customer Communications is revising the 501 Queen map on the TTC.ca site to better show the 501M service information.