Innocent Spouse, or Injured Spouse? They are different.
When a Form 8857, Request for Innocent Spouse Relief, is filed with the IRS, it may take up to 6 months before a determination is made.
https://www.irs.gov/businesses/small-businesses-self-employed/innocent-spouse-questions-and-answers
Injured Spouse takes 8-14 weeks. Check the IRS WMR website.