Upvote:0
I think this question now arises more than in the past because the I-94 is electronic and people do not see it. When it was paper, it said "admit until..." and had a date usually six months into the future. Now you can check your I-94 at https://i94.cbp.dhs.gov/I94/ . What that means is you are good to stay until that day in the USA. Whether you do that stay in one go or interrupt it as many times as you want doesn't matter. (You need a multiple entry visa.) I have left the USA on a Monday and went back on a Thursday the same week and noone bat an eye.
Basically, the B1/B2 almost guarantees an entry at the border because the very point of the visa is to give you a deeper check than the border guard could.
Of course, nothing is a surefire guarantee, the last word is always at the discretion of the border official but you need to do something truly extreme to be not allowed in.
Upvote:5
No, there is not. Basically you need to be able to show that your trip complies with the requirements, among others that you not use the B visa to live in the US, and that you will not exceed your allowed period of stay (generally six months for each admission).