In the 10X Rule, Grant Cardone covers how we underestimate what we can achieve as humans and often shoot for goals that are mediocre. The 10X Rule says to take what you think you want and multiply that by 10.

Now how much time is that going to take? Multiply that by ten too. No matter how much time and effort you think something will take it’s going to take a lot more, if you guess 10 times more you will likely be safe. Plan for that.