I think, it is depending on the route and the check-in time is based on the first flight.
When flying IAD-MUC-FRA-TLL I always could check in based on T-23 based on the FIRST flight segment departure and not depending on the last leg (what coul dbe even more than T-30.
But that current T -30 thing and solely on LH flight (for the first flight segment) seems to me is related maybe to status of pax.
I am HON and for me it is so.
My wife and daughter are SEN and just yesterday they made checcin for their flights not connected to me, their check-in did open later.
But od course, it can be just something of Famous IT thing.
