How long does it take to change from a F-1 visa status to a permanent residency status?

6-12 months if all goes well. Goodluck.

DO I NEED TO BE WORKING TO INVITE SOMEBODY TO VISTE ME TO USA, FROM NIGERIA , I AM ON DISIABLITY

Not necessarily. You could provide accommodation and your friend should be able to support himself while in the USA. Goodluck.

I am a US citizen, I got married in 2008 my husband is not a US citizen.

Retain an immigration lawyer if you are not familiar with the immigration process to avoid denial of your case. Goodluck.

Can i travel into the usa with warent in maryland

You may expect to be arrested when entering the US. It is advisable to rectify this situation as soon as possible. Goodluck.

Can we stop OPT extension before the EAD cards arrived?

It would be unwise to work without a valid EAD. Goodluck.

What is the 'catch-all' provision for good moral character, when you are applying for citizenship?

I agree with the answers. You may wish to rectify this situation. Why are you not paying child support? Goodluck.

My nephew entered with a visitors visa in August. He was detained at the airport and questioned.

Retain an immigration lawyer to assist you, you did mention that he helped you at your job. Goodluck.

How long does it usually take to get an investor based green card?

Ninety days for EAD if you do not encounter RFEs for the main application. Goodluck.

It is advisable to retain an immigration lawyer to represent you at this stage to avoid denial of your case. Goodluck.

HOW CAN I GET MY BOYFRIEND OUT OF JAIL IF HE HAS AN IMIGRATION HOLD BUT HE HAS A BABY THATS SICK AND NEEDS HIM?

ICE will not lift the immigration hold. You can post bond when he gets to ICE custody or before the Immigration Judge. It is advisable to...