Yes. Pretty much 90 days. Even if more than 90 days pass, you can still marry her and she can get Lawful Permanent Residency, but until you marry her, she would be subject to deportation
and she can ONLY marry you. She could not marry anyone else to be able to stay and she wouldn't even be able to stay if she had U.S. Citizen children. That's a dangerous situation for you because she would be in her best bahavior until she got her green card
. So you have to be careful. Listen, I will give you information on the H-2B visa that you can look over. For an H-2B worker visa, it is expensive and difficult to get because you, the employer, would have to go through an expensive process called a Labor Certification where the position is advertised in the local media, the employer must receive all resumes and eliminate all candidates for valid reasons, not just because you have a job for her.
This is to prove that she would not be taking a job away from a U.S. worker. Here is a link:
If you want to try the marriage route, then there are 3 ways to bring her and none are very fast, unfortunately:
1) The K-1 fiancee visa takes 6 to 9 months, but you must have met before during the last two years in order to process it. The I-129F will cost $340 plus a $350 fee for the visa processing fee. After she enters the U.S., then you have to marry and then you have to pay $1070 for the I-485 and she will have to wait about 5 to 7 months and gets another interview that you attend with her so that she can get Residency.
2) The K-3 spouse visa takes 6 to 9 months, you must be married. The I-129F will cost $340 plus $420 for the I-130, and $350 for the visa processing fee. Then after she enters the U.S., you must still file the I-485 for $1070 and wait for the marriage interview about 5 to 7 months later.
3) The CR-1 visa (or IR-1 if your marriage is more than 2 years old) takes about 1 year or so. You must be married. The fees are $420 for the I-130, $330 for the visa processing fee, $88 for an Affidavit of Support fee. But once she enters the U.S., she enters as a Resident and she does not have to file (or pay for) an I-485 nor does she have to attend an additional interview. She just gets her green card in the mail a few weeks later.
So the K-1 and K-3 are faster but generally more expensive. The CR-1 (and IR-1) are slower, but generally cheaper. And no, there is no middle-visa that she can use to enter the U.S. while that process is pending. She will most likely have to wait outside.
Here is a link to all three:
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