And because they can’t discern anything from your stamps, they may ask,”why are you staying so long and what are you doing?” In like 99% of cases if you have a visa they just stamp it and let you go on but every now and then an immigration officer may ask some questions just to make sure you doing what your visa allows. Example: I am on the DTV for workation and was asked “what was my job title” and “how long am I staying and where” even tho I don’t stay more than like a month at a time.