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My understanding is that values for these statistics are meant to be transmitted at least twice each second, and often more frequently than that.

The update frequency is 250 milliseconds for all Sierra_Chart market statistics assuming there is trading activity in the underlying symbols. Otherwise, there is no data transmitted. Within each 250 millisecond timeframe, the high and low extremes within that timeframe are also transmitted. Therefore, there can be more than 4 updates per second.

For example, for the 1-minute time period beginning at 15:30 New York time today, I count 18 seconds (almost one-third of the 60 seconds within the minute) where no tick data appears.