How long it takes to get green card through marriage with a permanent resident if the non residing spouse is already in USA ?

Presently it is taking about 2 to 3 years depending on visa availability. See visa bulletin.

I filed in my application for Asylum on the 27 of July 2017.It has been two weeks now but I have not received a letter of notice

I assume you mean June 2017 as today is July 13. Two weeks is normally the minimum time for receiving a receipt. Be patient it takes 2 to 5 weeks.

I-130 for sister of us citizen

There is no need to a new I-130 and no eligibility to do one for your niece or nephew

Canadian Citizen residing in US on H1B and pending Green Card application - can I travel to Cuba via Canada?

The restrictions apply to US citizens not to Canadian citizens.

Can I receive a L1 visa working in the U.S.?

employment must be abroad, outside, the US for on continuous year pout of the most recent three before eligible.

late filing is not considered as having failed to file

My son was approved for f2a and when I become a citizen the switched him to f1 can I switch back to f2a?

You can try by notifying the NVC of your interest in keeping the F2a

She will need to change status in the US from the B to the F. This will not happen timely and therefore the best alternative is to depart and...

Want to file for green card for my spouse but we are confuse

You file the I-130 your spouse files the I-485 also file for employment and travel along with the supporting forms and evidence.

H1 approved without i94 ?

1. check with the attorney that prepared the H-1B petition for the employer. Perhaps a COS was not applied or was denied and travel may be...