I once had three weeks then slipped. That was 21 whole days, I couldn't see how I would ever get that back again. A person told me "one day at a time" which helped. I also realised that I was exactly like the real alcoholic described in the big book of AA, so I got busy ... meetings, sponsor, steps.
One day I got a call from my sponsor to tell me I had made 90 days. No one was more surpised than me. I wasn't keeping track of time, just concentrating on the program. I had gone all that time witjout a serious urge to drink. Now its 38 years, by the grace of God.
I can relate. The first thirty days was longer than the first thirty years.