The master pushes data to the slave as soon as it has executed the query itself. It is not a periodic push, but an asyncrounous push as soon as data is ready to be sent. So the gap would only be as great as the latency between your two servers.
If the servers are disconnected or unable to communicate for any reason you need to be careful about your timeout values and connection retry values or they may not attempt to reconnect for a while and then there will be a datagap until they attempt to reconnect.
To clear up the terminology confusion - there is no push. The slave connects and asks the master to give it a dump of its update log.
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