I usually get a window seat so 1.7 second guy is never me. However, I much prefer 1.7 second guy over the guy that goes through the metal detector 5 times because they just can't figure out - take of all of your Jewry
Pre Covid there was a limit of 2 land border crossings per year, I think. Unlimited crossing by air. I did back-to-back extensions for years (2 or 3). Advice given to me by an immigration officer is to stay in the other country for a couple of weeks. So at the time I would go wherever spend a few weeks and come back with a fresh new visa, I never had problems.
I have heard of people getting denied entry so it is best to have a plan B.
I have inquired at the hospital a couple of times about donating blood. Each time they tell me come back in a few months when they're doing a blood drive.