code: func (b *Build) SchedulingDuration() (duration time.Duration, ok bool) {
  	if b.CreationTime.IsZero() || b.StartTime.IsZero() {
  		return 0, false
  	}
  	return b.StartTime.Sub(b.CreationTime), true
  }
docs: // SchedulingDuration returns duration between build creation and start.