36 months? Maybe it's something different. From what I know. DS-160 is the non immigrant from almost everyone fills out who's not a citizen of course. Then B1B2 is the visa given which is either business or pleasure but of course even though you're given multiple entries for up to 10 years it's still limited to 6 months max at a time.That's ridiculous. The DS160 gives 36mos or something? I guess the B1/B2 is longer term? TBH: I remember the days I didn't even need ID to cross at Ontario/NY State border crossings. I could cross with anyone in my family without issue. So, I am not a US visa expert (I have never needed one).