[GunRunner]

I’m simply saying, what’s the least possible number of generations necessary to see a new feature.

It's evolution; things are in constant flux.

You're not going to be able to see a "new feature", since whatever you're looking at has been making slow incremental changes over millions of years.

Biology doesn't work like an assembly line.

[PieterCasparzen]

But at some point there as to be a “new feature”, or there is no evolution, the species are unchanging.