The IRS does not provide a specific processing time for Form 8857, but it can take several months. It's not uncommon for it to take several months to get a determination. While your case is pending, the IRS may still pursue collection activities against you for the past joint tax years while your Form 8857 is being processed.
You may want to contact the IRS directly at 866-681-4271 to discuss your specific situation.
Hope this helps!
Cindy
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