When we got our setv (uk) online when didn’t put a return flight at all , we just noted in additional info box that we may extend an extra 30 days and as we were possibly going to be travelling to another Asian country we didn’t know from where we would be travelling back from , they were fine with that and didn’t query it , our airline (emirates) didn’t question it either as we had a visa
Yea they day you land is day 1 you leave on day 30 you technically can leave day 31 if your flight is at 1 am etc as long as you pass through immigration before midnight
we did think about the 90 day but didn’t really know what our travel plans would be to put in the application and we only wanted to spend around 6 months here to escape the Scottish weather and return for the warmer weather and biking season then come back November again
we wil just do the 30 day on flight back then apply for another 30 day extension that should take us to around mid April when it’ll be time to return to the uk for the spring/summer ,can’t really complain nearly
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months with 1 60 day and ext 1 waiver and ext and a 2 week visit to Cambodia