Join Date: Jul 2010
Location: Shanghai (PVG/SHA)
Programs: SQ Gold, AF Platinum, AA Platinum (sadly, expiring soon), QR Silver, EK, MU, HU, PR, HO, OZ, KE
Posts: 685
I just went through FRA a few days ago, transferring from Schengen flight on LH to non-Schengen flight on LH. I only had to go through passport control, but not security. My arrival time was around 1600 and my boarding time was 1650, departure time 1735. Believe it or not I made it to the lounge and even enjoyed a shower and some food before my flight, so yours should definitely be doable!
Amazingly, I got the exact same passport officer when going to OPO and again when returning from OPO...