How long does it take to process a visa

Over 2 1/2 years, unless you become a US citizen, which would shorten the process.

My friend is in Riker Island.He has a C Felony, Immigration went and met with him today. what can I do so he won't get deport it

Get him an attorney. If one cannot make it on such notice, have him ask for time to obtain one.

Should I reschedule my I-485/AOS interview?

That sounds like a very valid reason to me. Do not worry about rescheduling.

I recently apply for deffered action (daca) but I'm scared I won't get approved

Probably not.

While my asylum case is still pending, at this time could I leave US to another third country for personal reason?

You can leave but you will abandon the asylum application.

Immigration

Answer remains the same. Meet with a few and choose one with whom you are comfortable.

Immigration

You may have a lawyer. Reach out to few and choose one of your liking.

How long does it take for SSA to get the information to verify legal status from DHS?

It is normal. Time frame sounds about right.

File the 485 with the court and then file for a work permit. Once you have the work permit hire an attorney.

Asylum Question

Length of time to receive a decision has less to do with the decision than the workload in the office.