Timelapse toolkit lets you calculate how long your time-lapse needs to be in order to achieve a given output length. It will also time your time-lapse, either the traditional still image version or under-cranked video.
Details of every time-lapse you record are now saved, along with your GPS co-ordinates at the time. You can access this history and view the details of each time-lapse, including viewing the location on an interactive map. You can load those settings to repeat the time-lapse.
The app is available for free on the Apple platform with versions customised for iPhone and iPad.