Once you mail an amended return, it can take up to 3 weeks before it shows up in the IRS's system. After 3 weeks, you can go here Where’s My Amended Return? to check the status of it.
Amended returns can take up to 16 weeks to be processed once they receive it. And you can find a list of frequently asked questions, about amended returns, here Form 1040X, Amended U.S. individual Income Tax Return, Frequently Asked Questions
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