code: func elapsedTime(p *process.Process) (string, error) {
  	crtTime, err := p.CreateTime()
  	if err != nil {
  		return "", err
  	}
  	etime := time.Since(time.Unix(int64(crtTime/1000), 0))
  	return fmtEtimeDuration(etime), nil
  }
docs: // elapsedTime shows the elapsed time of the process indicating how long the
  // process has been running for.