Here is a link to a great data source that is updated continually. http://www.mplsrealtor.com/the100.aspx
Just choose the Entire Twin Cities from the pulldown menu, or select a city and you'll get a nice snapshot of the area, which includes days on market and the inventory of condos and single family homes.
The days on market for condos tends to be a little longer in most communities, although this figure is not tracked on the page in the link. The higher the inventory, generally, the higher the days on market will be.