We also get new slots by using DLA msgs, (oh for the days of SRR...) but on the REA msgs the default MINLINEUP is 0020 (taxi time). We'll change this depending on traffic situation and a/c position. Surely you must be able to input a MINLINEUP at LL??
However, like LL we also get slots coming forward to a time less than whatever MINLINEUP was specified and I can't believe they're all down to slow AFTN links.
Also, on the point on min MINLINEUP, we will often put it down as 0001 if an a/c has got to the hold early and it does work sometimes.
I've just seen the reply above and will take you up on it flowman if it happens again soon at KK too. Thanks.