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Frankfurt layover questions

I have searched the archives and read previous replies. It appears that if our flight lands on time that we will have adequate time to visit Frankfurt during our 8 hour layover. I have already noted instructions on what to do once we get there. (terminal 1) My question is, will we have any extra requirements coming back to the airport as we are going to Croatia (non-Schengen) to check in that would require extra time? We are not traveling til next year. We are in the USA.
Thank you!
Cindy