Qestions about I-485 REF & EAD

DW2003

Registered Users (C)
Hi, Guys

My first question is if I get a REF for my I-485, how soon I should give them the feedback. I know it should be as soon as possible, but my question is if they will give me a deadline ( like in 1 month, or something) to turn on my REF.
My another question is: Can I use my EAD in A company and use my H1B in B company at the same time. Of course it's a short time, like 2 weeks. Because I found a new job using my EAD, but my old employer will hold me for a while. So I don't know if I'll have some troubles about this if CIS knows .

Please give me some advice and your experieces.

Thanks a lot.
 
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