Thread: How do users select how many days their ad runs for?

How do users select how many days their ad runs for?

When a user is creating a classified ad, how do they select how many days they want to advertise for or the expiry date? My posts cost $1 per day and and 20c a day for directory listings. But there is no field when they are buying to allow them to insert the expiry date of their ad that will determine how long they want to advertise for. This is for events. Also, where do ads go after they expire? Are they in an archive folder that people can browse through?