I’m going with a Saudi air and I asked them as I’m there for 97 days but off to Cambodia for a week halfway through so to double check I asked Saudi air if I needed a flight out before visa free entry expires and they said no…but each airline is different,Turkish did ask me last year
you can get a 60 free entry stamp on arrival…leave within 60 days go to Nepal for say a week or so then return and get another 60 day stamp on arrival as it’s just been changed to 60 day stamp for uk passport holders