Let's look at one of the most common cooking methods: pan searing.
It's great for any relatively small piece of protein, like your steaks and your chops, your chicken breasts and fish fillets. All those meaty, meaty things we like so much.
We call this method "pan searing" because it produces a lip-smacking, golden brown crust surrounding a perfectly cooked inside. For chicken breasts, that's an internal temperature of 165 degrees. For steaks and chops and fish fillets — well, what do you like? Medium-rare? Well done? Obviously there's no one "right" way. And that's part of the challenge.
First, the good news: Pan searing is easy. Now the bad news: There's a caveat.
Here's what I mean: It's easy in the sense that there's not much to it: Drop a seasoned piece of protein in a hot, lightly oiled pan, then flip it halfway through. Done.
Here's the caveat: There are a zillion variables, and the only way to know those variables is to practice, practice, practice.
Sure, I can give some good advice that will improve your chances of success: Have a pan that's just big enough to hold what you're cooking and get it nice and hot first, then dry your protein thoroughly and season it. But, the sad truth is that most cooks simply want to know how long it should be cooked. And the answer, always, is, "Until it's done."
You see, because of those aforementioned variables, there's no way to predict exactly how long something will take to cook. Consider: