My summer commuting gets me into some freakishly good shape and as the season moves forward my 2 hour commute can be done in just over 1.5 hours on a nice day.

It is a 10km to get me out of the city on a reasonably nice route and the next 40 is wide open roads where one can really make some great time... after 25 km of gradual climbing where you can still keep a nice speed you get 20 km of gradual descent which will let you really make up some time as long as there are no headwinds.