Tokyo Skytree advanced ticket time slot

Hi,

If I have a advanced ticket to the skytree for 2 PM what is the time slot when I can enter and how long I can stay? Thanks

I purchased advanced tickets a few years ago, we entered at the nominated time, and I do not recall having to leave at certain time. By the way, we chose 5 PM tickets ( it was autumn then), as we wanted to see both day and night scenes.