This tool will help you making time lapses
Photopills is a mobile app letting you make time lapses. It has developed a free timelapse calculator available on their website.
We found this calculator useful! Thanks to it, you can estimate the duration of a time lapse based on the interval between each shot and the duration of the event shot. You can estimate the perfect interval between two pictures and the how many time the event must last to make the timelapse you want. More than that, the calculator lets you know how many storage spaces is needed and how many pictures will be taken.
Easy to handle and pretty complete, it can be very useful to prepare a time lapse in advance. You can test it here: Timelapse Calculator.