your kid must be very "stable" if he is asked to participate in an hour long interview with LH and then go for another one. My observations are that LH is trying to rival SH and it is looking for the best of the best, which is why they come up with the most unbelievable an-hour long interview in choosing PN and K1!
My friend said LH's k1 interview lasted for 1hour (instead of 2 hours the year before). If PN interview's also last for 1hour, then you may still can go to the 2nd interview (of course you need to call for a taxi) .