updatedAt property
UpdatedAt is when it last changed state, as Unix seconds — so the gap between the two is how long the build took.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
int? updatedAt;