Table:
text: 1973 Monte Carlo Rally
Itinerary
Stages of the 42ème Rallye Automobile de Monte-Carlo
Stage Start_time Stage_name Distance Winning_driver Time_ Avg_Speed Rally_leader
SS1 15:00 Col du Corobin 17.00km Sandro Munari Hannu Mikkola 13 m : 29 s 75.65km/h Sandro Munari
SS2 10:36 Pont des Miolans 26.00km Jean-Claude Andruet Jean-Luc Therier 19 m : 13 s 81.18km/h Hannu Mikkola
SS3 13:49 Laborel 20.00km Hannu Mikkola 15 m : 45 s 76.19km/h Hannu Mikkola
SS4 17:11 Burzet 50.00km Jean-Claude Andruet 38 m : 10 s 78.60km/h Jean-Claude Andruet
SS5 19:22 Le Moulinon 38.00km Bernard Darniche 27 m : 46 s 82.11km/h Jean-Claude Andruet
SS6 21:46 St. Bonnet le Froid 20.00km Sandro Munari 14 m : 51 s 80.81km/h Jean-Claude Andruet

Question: What was the finish time of stage SS6 of the 1973 Monte Carlo Rally?