After USCIS notifies you by email/text that your U visa have been approved, it really takes 30 days for them to mail your card?

It might be quicker. Essentially, USCIS is saying "don't bug us unless it's been thirty days."

Does Deferral Act require to find a job right away?

There is no work requirement for DACA.

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Do I have to continue F1 status after my H1B transfer petition made on Oct 1st?

You should talk to your employer's immigration attorney. I'm sure he or she will have a better grasp on your situation.

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Can I-601 waiver take more than a year to get approved?

Yes. Processing times are very long. That being said, it might be possible to get your Congressperson involved to find out why a decision has not...

I have a felony in my record. will I be able to help my husband apply for green card?

Depends on the felony. Adam Walsh Act could be an issue. Talk to an immigration attorney.

Can i send i-485/i-765 while i-130 still pending? (adjust status)

Yes. You can file the I-485 while the I-130 is pending. You should consult with an attorney though. I've had many people come to me after a Notario...

Details for "cancellation of removal"

Vacations will not hurt the calculation of the 7 year residency requirement. However, your question about the green card status versus citizenship...

I 751 abuse waiver.

You might want to consider filing an I-360 independently. The Service Center officers that adjudicate I-751 domestic abuse waivers are much less...

Does he have to go through the entire process again if my brother cannot appear for his visa interview for more than a year?

As long as he stays in contact with the National Visa Center every year, his file will remain open. He should contact NVC and ask them to cancel...

Would I have to wait till my son is 21 so he can apply for me

You might be eligible for an E2 visa or some other employment based non-immigrant visa. You should consult with an experienced attorney to explore...