Approved I-140: does it expire?

Dneprnet

New Member
I have approved I-140 (extraordinary ability) which was self-submitted petition. Currently on 3rd year of H1b. The problem that I may have to stay some time abroad (from 1 to 3 years) by personal issues. Does anyone know if my approved I-140 will be still good in that time. If I apply I-485 now and will get the GC (in 1 year per se or sooner) - I will be limited to abroad for no more then 180 days in a year.
Another question can I apply for the green card based on approved I-140 petition while abroad, say in Canada?

Thank you for answers
 
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