Okay kiddo, let me try to explain instruction path length to you in a way that you will understand.
Imagine you are playing with your toys and your mom asks you to clean up your room. You have to follow some instructions to get the job done, right? First, you pick up your toys from the floor and put them in your toy bin. Then, you take your books from the table and put them on the shelf. Finally, you make your bed and put away any clothes that are lying around.
Just like you have a set of instructions to follow when cleaning up your room, a computer also has a set of instructions to follow when it is given a task. These instructions are called a program. The computer reads the program one instruction at a time and does what it says.
Now, instruction path length is just the number of instructions that the computer has to follow to complete a task. Just like you have a certain number of steps to clean up your room, the computer has a certain number of instructions to follow to complete a task.
So, if a computer program has a lot of instructions, it will take longer for the computer to complete the task. But if it has fewer instructions, it will take less time. Just like cleaning up your room would take longer if your mom gave you a lot of instructions, but it would be quicker if she only gave you a few.
That's it, kiddo! You now know what instruction path length means. Was that easy to understand?