Hi. I had applied for my husband in May 2012 when i was a Permanent Resident. I recently got citizenship and have updated the status from LPR to US citizen by calling uscis afrer getting citizenship . They sent me an email stating" we have updated your relative petition to immediate relative of US citizen and is in active processing" our case is being handled by vermont service center.My question is that how much time it normaly takes for the approval of such applications. Can you please explain that how such effect of upgrading pthe petition works.