code: public EnvironmentConfig setGcStartIn(final int startInMillis) throws InvalidSettingException {
          if (startInMillis < 0) {
              throw new InvalidSettingException("GC can't be postponed for that number of milliseconds: " + startInMillis);
          }
          return setSetting(GC_START_IN, startInMillis);
      }
docs: Sets the number of milliseconds which the database garbage collector is postponed for after the
  {@linkplain Environment} is created. Default value is {@code 10000}.
  <p>Mutable at runtime: no
  
  @param startInMillis number of milliseconds which the database garbage collector should be postponed for after the
  {@linkplain Environment} is created
  @return this {@code EnvironmentConfig} instance
  @throws InvalidSettingException {@code startInMillis} is negative