code: public TimeStats estimateTime(Object projectIdOrPath, Integer issueIid, int duration) throws GitLabApiException {
          return (estimateTime(projectIdOrPath, issueIid, new Duration(duration)));
      }
docs: Sets an estimated time of work in this issue
  
  <pre><code>GitLab Endpoint: POST /projects/:id/issues/:issue_iid/time_estimate</code></pre>
  
  @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance, required
  @param issueIid the internal ID of a project's issue
  @param duration estimated time in seconds
  @return a TimeSTats instance
  @throws GitLabApiException if any exception occurs