Instructions
Run the "Starcraft II Editor" and open the map for which you want to edit build times.
Click "Modules" and select "Data." You can also press F7 to launch the Data window.
Click the "Search" field and type the name of the building that produces the unit for which you want to alter build times. Folders appear in the results section.
Click the "Train" folder. Two options appear reading "Building Name - Train." For instance, if you have the Barracks selected, "Barracks - Train" appears.
Click the top option. "Units" appears in the right pane.
Double-click a unit from the right pane. A window pops up with editing options.
Change the "Info - Time" field, located near the bottom, to your desired build time. The "Starcraft II Editor" displays time in seconds.
Click "OK" to save the changes.