It depends on what you query the monitor for. The communication language allows you to ask for specific data at specific intervals, so you are not limited by what is shown on the screen.
You can ask the monitor to send out unsolicited stream of messages containing all the data you have requested, at an interval you specify - in this case, the number of messages can be calculated using the interval.
Or, you can program your data client to actively query the monitor at the interval you prefer. Then, in response to each query you will get a solicited message containing the data you requested.