SEPM 12.1 - Purge Client Option - Consequences?

Hi,

I originally posted this question int he wrng place, so apologies!

The purge clients options (in Admin > Servers > Local Site Properties > Domain \ "delete clients not contacted for xx days"

Default is 30 days, right?

Do you have any recommendations on changing this time?

Also what is the consequence of a client being deleted and comes back online in future?  Will it simply create an entry in the Databsse again at the last group it was a meber i.e. config in the sylink.xml file and download defs or will it be an unmanaged client?

Any other considerations for using this options please?

Thanks