I am thinking of setting up a 090 technical number, what do you reckon Al?...
Anyway, how you program this would be dependant on a front door contact.
You haven't mentioned if you have one so Hall will be Entry and Landing would be off in part set.
In this configuration you can walk about on the landing and then the timer will start upon entering the hall. This would also be the same if a burglar entered the hall BTW.
Have you installed you own system or are you just querying if it's possible for an installer to do?
We are also assuming you have a Texecom Premier 24 from your username but you haven't actually named what panel or how old it is.