You get 2 land border crossings per calendar year (01 Jan -31 Dec)…there is no official limit on Air Ins but you will eventually be questioned by an overzealous Immigration officer…all 30 day visa exempt stamps can be extended at your local immigration office for 30 days at a cost of ฿1,900 until an I/O days they can’t…. good luck
I guess I read her bullet different than you... This morning…
My husband went to the immigration meeting the same officer who told him that “I’m sorry we made a mistake, your overstay is exactly 90 days so we can’t let you cross the border here. You should fly back to Thailand instead.