Well an absolute beginner would assumedly take months to become fit and there are no benchmarks to fall back on.
Even with a benchmark it can be confusing. As an example, I had some super-talented individuals who showed great progress without enough fundamentals in place for my liking. I’m sure if i had bypassed that step and gone straight to an emphasis on speed/SE, they would have reached a plateau prematurely.
I guess the smart-ass answer to enough fitness is similar to the answer given by the supreme court justice when asked to define pornography: “I know it when I see it!”
I haven’t really got a better definition of enough fitness, I’m afraid.