public Integer getMaximumTimeBetweenPings() {
    return maximumTimeBetweenPings;
  }
get the maximum time between pings in milliseconds, the default is
CacheServer.DEFAULT_MAXIMUM_TIME_BETWEEN_PINGS = 60000

@return the maximum time between pings in milliseconds
geode-management/src/main/java/org/apache/geode/management/configuration/GatewayReceiver.java