All PhD students admire their supervisors and appreciate their seemingly endless knowledge on their subject. It is important to have in mind, though, that by the end of your PhD you are expected to have greater knowledge on your particular subject than your advisor. As you proceed, you will find out that they cannot always answer your questions or help you much in specific problems you face (e.g. running out of memory when developing a programming code on Graphic Processing Units). It’s part of your own research and learning process to search and find answers and solutions for a myriad other questions and problems while trying to accomplish a task. The role of your advisor is to – guess what – provide advise when you get stuck, with their educated guess and intuition.

By the end of your PhD you are expected to have greater knowledge on your particular subject than your advisor

Bear in mind that this additional searching is one more reason you should not underestimate the effort that is required for a particular task.
In addition, try to make sure from the beginning that what you will be mostly working on is a novel subject of which you can claim ownership. Otherwise, spending your days and nights “doing the chores” is just time wasting and it might end up in problems when it comes to your defence and graduation.