the buses are literally marketed as “visa boarder run buses” back in 24 hours, but yea if you find someone very pedantic or stuck in the old ways you may have a issue. My bus of 30 tourists all made it back without deportation or fines monkey house or anything pal
I always get the standard 30 days get the top ups at immigration then once times up then hop boarders on a bus for next to nothing. Then repeat step 1? I managed a good 9 month trip doing that, never had an issue. #pattlife