The September 2013 release of TFS Build Extensions is available for download now. There are some cool new activities added to the library. Amongst them is the BuildStepDuration activity. It is a very simple to use activity that allows you to view a break down of build steps and the time each build step took in a completed build. This is really useful for build masters who are looking to optimise their build and are having a hard time in getting the information from Visual Studio build details window, which shows all information in a hierarchical way.
More information can be read from the activity documentation http://bit.ly/15VuILe.
The latest version of TFS Build Extensions can be downloaded from here.