“From this point of origin, further reports of vandalism diffused. Looting and fires spread through the Northwest side of Detroit, then crossed over to the East Side. Within 48 hours, the National Guard was mobilized, to be followed by the 82nd airborne on the riot’s fourth day. As police and military troops sought to regain control of the city, violence escalated. At the conclusion of 5 days of rioting, 43 people lay dead, 1189 injured and over 7000 people had been arrested.”
http://www.67riots.rutgers.edu/d_index.htm
They are listing it as 5 days but it really lasted in some form all summer.
I think more people were killed in LA during the 92 riot — whether from the riot or the normal drive-bys is debatable.