TradeStation Help
On the Advanced tab, you can change the Timeout Duration from 10 seconds to 2 minutes. The timeout duration is how much time Scanner will wait for a data request before it will drop the symbol from the list.
Tip: When you set the timeout duration to a lower amount of time, the scan will process faster but there is a higher risk that some symbols will be dropped if there is any delay in retrieving the data. A higher value may take longer to process but has less risk of symbols being dropped.
Access using the menu bar View > Scanner Preferences menu sequence and select the Advanced tab.
Timeout duration
Click OK to apply changes, or Cancel to exit without changes.