No such thing. All really depends on how consistently they work on your application. If you work consistently without breaks+application has low complexity, a few months at best. Anything else can go long. The key is to look for what went into progress, what's completed and what isn't started.
My entire application was completed in 19 days, but nothing went into "progress" in tracker. So, there are different databases that are synced/unsynced/differently batched. FD isn't even a thing for everyone. I didn't get any FD in GCKey at all. PR tracker lagged significantly and showed nothing completed before I sent my passports for stamping. That goes on to show just how unreliable most info here really us. Key is to see what info you see, what's your application's complexity, etc.
