The Estimate Summary can be found at the end of all your specstimates. This shows in brief what were the services used in the document, how much they cost and how many hours you spent on each of them.
In the right part of the summary you will see a Pie Chart. This is a graphic that shows you the proportion of the time spent on services. Also, at the bottom of the chart you can have a view over the total number of features within your document and their statuses.