There is no default value and you can configure the interval of polling, check wmi.conf documentation http://www.splunk.com/base/Documentation/latest/admin/Wmiconf
interval = <integer>
* How often, in seconds, to poll for new data.
* This attribute is required, and the input will not run if the attribute is
not present.
* There is no default.
Doh! I knew that I knew the answer before posting the question.
It's in the config file but not in the UI.
Thank you.
There is no default value and you can configure the interval of polling, check wmi.conf documentation http://www.splunk.com/base/Documentation/latest/admin/Wmiconf
interval = <integer>
* How often, in seconds, to poll for new data.
* This attribute is required, and the input will not run if the attribute is
not present.
* There is no default.