Can i use the ticket for visit the tower more time during the day? For example come in the morning and come again with the same ticket during the sunset?

There is a different day and night ticket. I had bought the city pass, it include 2 passes, one for day and one for night. The condition is that you have to go the same day else it becomes invalid.

No. But you can wait in line for the glass bottom picture area as many times as you would like.

I think the ticket is a one time use only so you'll probably have to pay again if you come back at sunset

I thinks not

Not sure, but I wouldn't count on it.