Depending on the application of the blade
In a nutshell, time and experience are the key factors in understanding that statement. The difference between a KSO (Knife Shaped Object), and a Quality cutting tool is the understanding of the many factors that go into it. The information most available on heat treating numbers and times is merely a starting point. As you gain experience, you will start to understand that steel type, COMBINED with heat treatment, COMBINED with geometry, COMBINED ALL the other factors that you, as the knifemaker put into the knife's creation, down to the tiny details, is what makes the difference(s).
These factors can be from slightly, to significantly different based on the end application.... Kitchen, hunter, chopper, campe, fighter, survival, etc all have certain aspects that are desired based on the end use.
For example..... a kitchen knife is generally thin, and can often be much harder, as it's expected to slice, and maybe some mild chopping..... where as a camp/chopper should be slightly to significantly softer to absorb the abuse of hacking on things in an outdoor environment.
This is all due to the variables that are present, not only in our home shop environments, but in how we each envision the "right way" to create the blade/knife we are working on. Knifemaking/Bladesmithing is NOT a one size fits all type of thing..... and that's where the time and experience comes in. If you're not learning with each blade/knife you produce, then you've already missed the boat. Even after 30+ years of Bladesmithing, I still learn something new, each and every time I go to work in the shop. For me, always seeking improvement, and learning those "new" things, is what has kept my deep interest and adoration for this craft.