code: @Override
      public Long getMinimumFinish() {
          calculator();
          if (simple) {
              return v[2];
          } else {
              Weight minFinish = cn.getMinimumFinish();
              return minFinish.isInfinity() ? null : minFinish.value();
          }
      }
docs: /*
  (non-Javadoc)
  
  @see org.virginia.pbhs.parameters.Interval#getMinimumFinish()