td43, posting the same question on different tabs/threads isn't necessary.
However, it's all relative.
23-24 is awful compared to elites, but is amazing compared to couch potatoes.
It depends how long you've run, how much training/mileage/specificity you've put in, and what your potential is.
If you've run for 20years, hardcore mileage, expert coaching, and are 47 years old, your ability to improve will be miniscule.
If (more likely), you're a newbie, who hardly trains, most likely you'll improve hugely at first.