code: public GetReservationUtilizationResult withUtilizationsByTime(UtilizationByTime... utilizationsByTime) {
          if (this.utilizationsByTime == null) {
              setUtilizationsByTime(new java.util.ArrayList<UtilizationByTime>(utilizationsByTime.length));
          }
          for (UtilizationByTime ele : utilizationsByTime) {
              this.utilizationsByTime.add(ele);
          }
          return this;
      }
docs: <p>
  The amount of time that you used your RIs.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setUtilizationsByTime(java.util.Collection)} or {@link #withUtilizationsByTime(java.util.Collection)} if
  you want to override the existing values.
  </p>
  
  @param utilizationsByTime
  The amount of time that you used your RIs.
  @return Returns a reference to this object so that method calls can be chained together.