Why does SqlSentry Plan Explorer not give the duration of my queries?
Martin is correct, in order to see duration and other metrics from an actual plan with Plan Explorer, "Get Actual Plan" must be run from within Plan Explorer. Actual plan XML does not contain this data, regardless of source.

Plan Explorer FREE uses STATISTICS TIME &amp; IO behind the scenes and auto-correlates the data with the plan tree, and Plan Explorer PRO uses a dynamic rowset trace for this purpose. An advantage of the latter method is the ability to provide the full call stack including plans and metrics for embedded dynamic SQL calls. Neither method is affected by statement duration.

This is why we use our own .queryanalysis file format when saving plans from within Plan Explorer, as it contains this extra metadata along with the plan XML.