This could vary greatly depending on the merits of the case, anywhere from 3 months to more than one year.

H1b extensio APPROVED till jan2016 on pending perm. Lastweek,perm was denied. Can I continue working with same comp till jan2016

Yes, you should be able to continue working in H-1B status until that date, unless the H-1 petition is revoked.

Can I change name when a citizen daughter applies for green card?

You can change your name when naturalizing as a US Citizen but not when seeking a green card based on your daughter's petition.

Can I file for L2 EAD when my I94 extension is in progress?

USCIS has issued guidance on this question and you should be able to file for a work authorization based on proof of the principal's L visa status.

I140 Appeal (MTR) has been dismissed, can i refile the I140 with the same PERM approval?

PERM is valid for 6 months, but if an I-140 was filed within that time, the employer could file a second I-10 based on the same PERM outside of...

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My husband received a Request for Initial Evidence (i485) to submit a complete Federal income tax return

Yes, the petitioner must fully execute a Form I-864, even if you are also using co-sponsor.

I am a recident in USA for 3 years

Yes, lengthy absences can interrupt the period of continuous residence required for naturalization, as well as jeopardize your green card status...

Your Alien Registration no was changed for the I130 you filed. Is it a positive change.

Reassignment of an A number does not necessarily mean anything relative to the approvability of your case.

H1 B Stamping outside US

There is no hard and fast rule, but you should have ample evidence of maintenance of status with you when you appear at the US Embassy.

The officer did not give me my pictures at the interview to sign

The delay could be due to background clearances or a host of other issues.