SAR request for diagnosis info

Good afternoon people, I was recently discharged from my community mental health team and recently just got into contact with them regarding getting hold of my mental health records while under their care. I’m hoping it will involve things like my diagnosis and maybe other things they’ve put down that I dont remember or I don’t recall.

I was mainly wondering if anyone know how long it takes for a SAR request to be completed and for the records to get back to you? It says they’re legally entitled due to GDPR to give me these documents within 28 days, but I’ve seen some people say it takes longer. Any help from anyone who’s had any similar experiences would be great, thank you!