How long will it take! I just mail it out on the 3rd of March

How did you indicate you wanted your tax refund sent to you? If it was in a check you'll have to wait almost 2 months to get a paper check in the mail. If it was a direct deposit you should get it any day now.

I mailed my amendment feb 17 when should I look for it to come.

If you have not yet gotten the check, call 1-800-829-1040 and ASK the IRS for a status of the refund.