There is no set time for processing a waiver. Check the status of your case regularly online. There is a current regulations for a provisional waiver pending. That could impact waiver applications.
I agree. However, your immigration lawyer should have drafted the waiver, affidavits of extreme hardship and documentation to go along with the I-601 waiver. You don't mention the U.S. Consulate; but if Ciuydad Juarez, expect anywhere from 2 to 5 months for a decision.
Rehim Babaoglu, Attorney At Law
THOMASON, HENDRIX, HARVEY
JOHNSON & MITCHELL, PLLC
Suite 2900, 40 S. Main St.
Memphis, TN 38103-5529
tel: (901) 525-8721 fax: (901) 531-8514