In mid febuary i applied for and recieved an eta for Sri Lanka.All was well and we used it on our holidays. On return i put it in the bin.Since then i have been given the chance to go back and so i went on the eta website to re apply and it says i am in posession of a valid visa. I think the eta was valid for 30 days and so i am wondering if i should wait until the other has expired to re apply. On the eta website it does say something about a visa being valid for 90 days and if this is so does anyone know if i can re use the same visa? I am really confused about it . Also wondered about the possibility of applying when i arrive. Not sure what to do, anyone else in a simular position? Thanks.