DownloadTime is a free utility that you can download via Cydia. It helps you calculate the estimated time it would take to download a file over the Internet, given a particular network speed.
I see no reason why one will need this app given that when you on your desktop / notebook you can easily calculate the same using the calculator and moreover what we need is an estimate of how much time it would take while downloading this app on our connection from the given source. Which is displayed on the download window generally. However here is a free utility on the iPhone / iPod touch. Use it if you need it.
Search for “downloadtime” on Cydia