Welcome to planDisney, Tomer! I'm so glad to be able to answer your question today.
If you have a ticket and a valid
Disney Park Pass reservation for
Magic Kingdom Park, you can enter the Theme Park at your leisure any time between opening and closing! It's totally up to you and how you want to plan your day. Time will only be a factor if you have a ticket with the Park Hopper Option, and you're starting somewhere else. For example, let's say that you have a Park Hopper ticket and a Disney Park Pass Reservation for
EPCOT. You can start your day at EPCOT and enjoy all the attractions and delicious food there, and you can choose to hop over to any other Theme Park, including Magic Kingdom Park, beginning at 2:00 PM. If you choose to Park Hop, keep in mind that you
must use your ticket at the Theme Park at which you have a reservation before you can hop anywhere else. So, using our previous example, you can't make a Disney Park Pass reservation at EPCOT, skip that Theme Park altogether, and then go tap into Magic Kingdom Park at 2:00 PM.
Remember, no matter what type of admission you have, you can enter, leave, and re-enter a Theme Park at your convenience! I love to start my day early and take advantage of those cooler morning hours when the wait times are typically lower. Then, after lunch, I'll leave and go for a swim or a nap at my Resort Hotel, and re-enter the Theme Park in the evening to enjoy more attractions and catch a nighttime spectacular! There is lots of flexibility built into your admission so you can choose to enjoy your Disney vacation in whatever way works best for you.
Have a magical day, Tomer!
Jessica