Each WMI query will have it's own configuration, and you can adjust the interval independently.
Configure via the Manager:
In the Manager, choose Data Inputs, then WMI Collections. Each WMI input will have its own entry there, with the polling intervals shown.
Click on the name, e.g. LocalProcesses , wait for the page to display, and change the option Poll Every at the bottom of the screen to your desired interval. Click Save.
or, Configure via the Config Files:
First, look at the default configuration in $SPLUNK_HOME\etc\apps\windows\default\wmi.conf to see the default configuration. Make particular note of the stanza names and the interval setting.
Then, create a new file or edit the existing $SPLUNK_HOME\etc\apps\windows\local\wmi.conf (local vs. default).
In that file, create a new stanza matching each of the settings you want to override, e.g.:
[WMI:LocalProcesses]
interval = 600
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