Paul Corfield wrote

person has to wait more than a maximum of five minutes to pass
through
the ATGs. This figure has been applied to all ATG schemes installed
on
national rail network to date, although station operators should aim
achieve a waiting time of no more than three minutes.

This means queues on stairs or else on platforms which may be
problematic if another train turns up before the previous load have
exited the station. Add in the fact that some NR trains can be

Very few NR stations have that frequent a service, certainly Wandsworth
Town doesn't (six minutes minimum).

What the busiest NR in that sense ?

What is queuing to leave like at Kempton Park ?

Wimbledon has 18 an hour serviced by one platform/ two faces.

--
Mike D