There are a number of locations to determine the SOLIDWORKS Costing time per operation and total time required per part. The calculated time is based on the templates for setup time (load/unload, machine setup) and operation time (milling speed, drill speed, etc).
Within the Costing Design Tree, you can toggle between Show Cost and Show Time. This will provide values per operation.
For actual operations (eg. Mill, Hole), you can expand the operation and hover your cursor over to get a Tooltip.
For a complete break down of time per operation as well as the total time required per part, you can generate a Word or Excel report with all of the details. Be sure to select the Detailed Report option.