public RegionFactory<K, V> setRegionIdleTimeout(ExpirationAttributes idleTimeout) {
    attrsFactory.setRegionIdleTimeout(idleTimeout);
    return this;
  }
Sets the idleTimeout expiration attributes for the region itself for the next
{@code RegionAttributes} created. Note that the XML element that corresponds to this method
"region-idle-time", does not include "out" in its name.

@param idleTimeout the ExpirationAttributes for this region idleTimeout
@return a reference to this RegionFactory object
@throws IllegalArgumentException if idleTimeout is null
@see AttributesFactory#setRegionIdleTimeout
geode-core/src/main/java/org/apache/geode/cache/RegionFactory.java