HeartbeatInterval Property
Returns or sets a Long for the interval between updates for real-time data. Read/write.
expression.HeartbeatInterval
expression Required. An expression that returns an IRTDUpdateEvent object.
Remarks
Setting the HearbeatInterval property to -1 will result in the Heartbeat method not being called.
Note The heartbeat interval cannot be set below 15,000 milliseconds, due to the standard 15-second time out.