What is the duration of E1 visa?

The duration of an E1 visa is based on reciprocity between countries. You may check the reciprocity tables for the E1 visa country.

It is likely the applicant will be asked in detail about a past F1 visa denial during an O1b visa interview.

Hi, Can i apply H1B from multiple consultancy ? if H1B approved for 2 consultancies , Can i choose any one ?

if H1B approved for 2 consultancies, the H1B beneficiary can choose one for H1B employment.

Can I apply H-4 Extension and H-4 EAD together?

The spouse of an H1B may file an H4 extension and H4 ead together.

H-4 Extension need to submit to the same service center, where the H-1 got approved?

H-4 Extension needs to be submitted to the service center having jurisdiction where you live.

Family with expired tourist visa with a kid (not a DACA recepient), what's their future here in the USA?

Their future is bleak absent additional information to provide some hope. Consult with an immigration attorney.

Is it mandatory to file AC21/Supl J to be continued beneficiary of I-140 ever after changing from sponsoring employer?

Generally, USCIS will send a request for Supplement J when you near your priority date.

H1 B Amendment Question?

Generally, the last in time would rule. An amended petition was filed to return you to A.

My priority date is blank ( i -130 ) it s important?

The I-130 approval will list the priority date for the form

Divorce right after approval of I-751

Every naturalization case will be thoroughly reviewed. No explanation at this time is required.