How long does it take to get US citizenship from the moment of applying?

Your question lacks the requisite information to adequately assist you. If you are referencing the N-400 form, the processing time depends on where...

I have student visa in US. My father filed for EB-5. Will CBP give me a hard time the next time I travel and return?

I agree, you shouldn't have any trouble re-entering with F-1.

Don't forget the filing fee for Form I-765. Also, look at the "Required Documentation" section of the instructions.

How can I expedite parents PR process ? As they r the victims of earthquake in Nepal, how can I bring them 4 treatment in US?

I agree. You will file Form I-131 and Form I-134. If you need assistance, contact an attorney directly. Here is the link with some basic...

Yes, you can. How long does he plan to stay?

Can you maintain permanent residency if you do not spend most of the year in the U.S.?

As long as you apply for a re-entry permit (and stay out of trouble) you will not jeopardize your green card. You will submit Form I-131. See this...

How I can bring my spouse in USA while her immigration petition is waiting for priority date to become current at NVC?

Unfortunately when there is an immigrant petition pending, it is very difficult to get a tourist visa (or any other nonimmigrant visa) unless your...

You will need to contact an attorney directly to discuss your eligibility for an E-1 visa. You (and your family) can adjust while in valid F-1...

Will I get the tax change reimbursed in my next paycheck?

This will not affect your immigration status or H-1B. You should take your question to a CPA when you file your tax returns.

Should I do a study abroad to clear my EWI?

Advance parole, even when approved, does not guarantee entry into the United States. Your entry at the border is at the discretion of the CBP...