From: Zagreb, Croatia
You might miss the next flight
You should be able to ride the airport express into the heart of the city. The S1 takes 42 to 46 minutes into the city.
You need 1 hour (roughly) to the city and one hour back - that's 2 hours. And you have to be at the airport at least 2 hours before flight. That's 4 hours. And you have just about 6 hours to spare... that's very close...
Prior Preparation & Planning Prevents Pathetically Poor Performance!
A & B: WitW, WitE, WbtS, GGWaW, GGWaW2-AWD, HttR, CotA, BftB, CF
P: UV, WitP, WitP-AE