I feel like mentally changed permanently tbh Mainly in regards to anxiety about things I didn’t think about before
My husband and I hit a rough patch for I’d say at least 6 months while I was adjusting. It’s not all on the mother though. I don’t know your circumstances and there’s factors that could affect it. I think it depends on things like are you working and how much support your spouse/SO is giving. I had to quit my full time job to help myself mentally since my husband offers little to no help. (He usually works 50-55 hours a week and makes a lot more money than I did) I didn’t get better mentally until I quit my job when my daughter 1 yr 3m. I took 4-5 weeks to fully physically recover. I still didn’t want to be intimate for like 3 months.
I would say it took me close to a year. I didn't have PPD but I was a super independent self reliant person before and it was a huge change for me. My breastfeeding journey was hard on me and I took that to heart a lot and my lady bits took a beating and I needed repair surgery so that took a long time to get back to any normalcy. I don't think there's a black and white recovery time, everyone is different because the circumstances are different. Either way give yourself grace and congratulations on baby number 2.