How long to get back to normal/baseline

I’ve been on 20mg IR for about 4 years. The first 2 were fine, but about a year and a half ago, I started abusing it—sometimes up to 80mg daily. I feel like it’s hurt my sleep, relationships, and memory, and I don’t feel like myself. I’m now tapering back to my prescribed dose since I still feel like I need it. How long does it take to feel normal again after abuse? I know it’s different for everyone but I just want a rough idea so I know what to expect.

Also, any tips to help speed up this process?