How to set a refresh rate in a Subscribed Calendar using the ical on the iPhone / iPod Touch / iPad how can I set the refresh rate?

or does it pick the refresh rate that I had set up in the Mac iCal App?

If no refresh rate was given in the Mac iCal App, what is the default refresh rate? 30 minutes?
In "Settings->Mail, Contacts, Calendars->Fetch New Data" you can setup what to do. Depending on the account you can Fetch or Push updates to your iPhone - or choose to do it manually.