I am deploying XtremIO with RP 5.1 Snap based replication.

I am trying to understand the relationship between maximum number of snap, protection windows and RPO settings.

The RP guide mentioned for XtremIO it is recommended to set the replication to periodic.   The default interval is 30 min and the RPO will be twice the specified interval and cannot be changed.  The maximum number of snap per cg is 80 (default) max is 500.

My understanding is Xtremio minimum RPO is 60 seconds so in that case how should the value of periodics to be set and what is the maximum protection windows with 80 snaps per cg.