I had 2 J class trips (first from SIN to Madrid and 2nd from SIN to Munich) which was only 1 hour turn around. Both times my flight arrived in DOHA late and I was whisked away by the ground staff. There were no security checks at all.

However, my luggage didn't arrive in Munich as planned. What pissed me off is that the ground staff in Munich already know about the luggage delay but they didn't come forward to announce it. Luckily I felt something wrong when most of the luggage are out. I had plans to travel to Berlin 2-3 hours after I arrived Munich. The luggage arrived almost 48 hours later in Berlin.