sudden twang
I don’t think you have to go P1 SH for a LH cmd in BA
Happy to be corrected by the likes of White Van Man but unless it's changed in the last couple of years the answer is no you don't.....P2 LH -> P1 LH is possible and a very well worn path
but time to LH command is basically governed by time in company, not on time on type or time in role....Long Haul Command about twenty years after joining the company sounds credible, it was up at around that when I left.
(For completeness I seem to recall a few decades back in the history there was a SH requirement prior to LH).