The command will estimate the number of monitor counts needed to make the scan run for a given amount of time. This function uses SCAN HOWLONG and scales the monitor counts according to the desired running time.
The Rate command should be run before Scan Automon. If it has not been run when Scan Howlong is run, it will be run automatically before a result is given, unless a scan is in progress, in which case the command will fail.
[duration] is a whole number of hours
[scan_name] is a name in the scan list
[scan_index] is an integer representing the position in the scan list