ex-koelner

Difficult to estimate. SXF has become quite unpredictable. On a normal weekday, quite likely that you will make it, but in peak times on weekends or during holidays it can be risky. It will much depend on the time and how many other flights arrive at the same time. If there are a few non-Schengen flights, queues at passport control can be long. And there is no transfer corridor at terminal D, so you have to leave the arrival zone and clear security again together with all departing passengers. While distances are not long, security can take some time. I would allow more time, I think.