WHBM: I have done 18 minutes (actual, inbound was late) at Munich between on the blocks inbound from London City, and door closed on a departure to Russia.
I did about three minutes at Luxembourg, inbound from FRA on a Luxair F50 to outbound to BRU on a Sabena Metro, with its stbd engine already running!
Why I was making an interline transfer at LUX on a FRA-BRU is another matter ... (the things you do to avoid Lufthansa)