We checked this out before our dinner reservation and I gotta say I'm glad we did it was awesome and the views where amazing even though we went when it was dark out we still got charged for day time rates. Also if you show your players card like most places the take a buck off so make sure to do that. The wait wasn't long at all and the elevator is pretty huge so it can fit a lot of people in it but I think they do limit how many people are on the observation deck at one time. As far as I know you can stay up there as long as you want I just have one suggestion and that is to make sure you stay for one of the Bellaggio fountain shows well worth and it gives you a different perspective on the show! The views are amazing and they have little slots where you can take some awesome pictures. I also thought going at night and seeing all the neon would be better than a day trip up there but to each there own.