default long getRpcTimeout(TimeUnit unit) {
    throw new NotImplementedException("Add an implementation!");
  }
Get timeout of each rpc request in this Table instance. It will be overridden by a more
specific rpc timeout config such as readRpcTimeout or writeRpcTimeout.
@see #getReadRpcTimeout(TimeUnit)
@see #getWriteRpcTimeout(TimeUnit)
@param unit the unit of time the timeout to be represented in
@return rpc timeout in the specified time unit
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Table.java