No reliable for sure way to calculate when you will get better. There are just too many other factors that come in to play.
Your overall health before infections
Finding a treatment that works for you
Length you were infected before any treatment
Im sure there are more reasons
I do believe that if you have a good llmd,llnd,NP or self treat properly That in 15 to 18 months you could have some improvement, but possibly not healed.
But then some people are healed sooner than that too.
Like sierraDon said treatment is individualized.