There is no set rule, it depends.
I use a method where the steps are taken in 4-5 weeks, but that does not mean it's finished. It's a duplicatable method we were shown at a steps workshop.
All references are BB with some archival early AA history.
Step 4 method is Dr Bob's carried over by his sponsee, Clarence S.
If you want to know where to download the MP3 files for this method, PM me.