Having floated the southend of the Bow countless times both fishing and just relaxing I will provide some approximate drift times. Drift times are always pretty loose as it will be fully dependant on flow rates and how actively you remain in the main current.
A decent boat is a must and a life jacket is not optional. A good set of oars and oarlocks will make your time a whole lot more relaxing.
Aproximate summer drift times:
17th Ave - Glenmore Trail bridge - 1hr
Glenmore bridge - 22x Bridge (Fish Creek/Deerfoot Meadows launch)-1hr 30min
22x - Deerfoot Bridge (north of Dunbow Road) - 1hr30min
Deerfoot Bridge - Policeman's Flats - 15 minutes
Policeman's Flat's - McKinnon Flats - 2hr30min
Both Fish Creek and Deerfoot Meadows are relatively easy takeout points, the boat launch is on the Fish Creek side.
Launch at Policeman's Flats is fast flowing and requires both experience and strong rowing/power boat to actually use the boat launch to land. There is an area of rocky bank in front of the parking lot that is a relatively easy takeout with an inflatable. Really if you don't use a boat trailer don't attempt to use the boat launch.
Launch at McKinnon is flat and slow, even the most piled up fisherman/floater shouldn't have issues taking out here. The only caution here is to be careful with vehicles in the river rock, it is loose and really easy to get stuck. I have pulled out many a truck from the launch at McKinnon.
Links to locations mentioned:
17th Ave Launch -
http://maps.google.ca/?ll=51.037658,...01714&t=h&z=19
Glenmore Trail Launch -
http://maps.google.ca/?ll=50.986838,...01714&t=h&z=19
Fish Creek Launch -
http://maps.google.ca/?ll=50.896234,...01714&t=h&z=19
Deerfoot Bridge -
http://maps.google.ca/?ll=50.854103,...06856&t=h&z=17
Policeman's Flats -
http://maps.google.ca/?ll=50.842646,...01714&t=h&z=19
McKinnon Flats -
http://maps.google.ca/?ll=50.805484,...01714&t=h&z=19