B1/B2 multiple entry visa to US

[me262 0]

My mother in-law received a multiple entry tourist visa to enter the USA from the Philippines and it is good for 10 years. My questions are how long can she stay for a visit and can she come on a one way airfare and purchase a return air fare after she enters the US.

[Boiler 43,434]

Up to 6 month's

Return flights are usually much cheaper.

[Penguin_ie 5,986]

*** Moving from Bringing Family to Tourist visa forum ****

Boiler is right, usually 6 months at a time though the officer at the border can decide to give less, especially if she has visited a lot recently. Technically, no return flight is needed for the B2, unlike a VWP entry. However, airlines may not transport her without a return/ onward flight, and she may have difficulty being admitted without such, as it could be interpreted as intention to remain.