Entrance tickets

I was looking at staying on the Yellow Mountains for a month or so. Will 1 entrance ticket suffice or will I need to purchase multiple? I was there before and done the hike to Emerald Pools which is abit out of the main route, so on my return from Emerald Pools I needed to go through an entrance gate and show my ticket...I plan to go there alot which means showing someone my ticket each day - is there an expiration date on this ticket or does the ticket last me my entire stay on the mountains until I leave?