Show Build Durations 
Show build durations in the Activity Viewer in Xcode's toolbar at the top of the workspace window.
- Tested on macOS: - Catalina
 
- Parameter type: bool
Set to true 
Show the build duration in the Xcode's toolbar
bash
defaults write com.apple.dt.Xcode "ShowBuildOperationDuration" -bool "true" && killall XcodeSet to false (default value) 
Do not show the build duration in the Xcode's toolbar
bash
defaults write com.apple.dt.Xcode "ShowBuildOperationDuration" -bool "false" && killall XcodeRead current value 
bash
defaults read com.apple.dt.Xcode "ShowBuildOperationDuration"Reset to default value 
bash
defaults delete com.apple.dt.Xcode "ShowBuildOperationDuration" && killall Xcode