Projects on Kickstarter can last anywhere from 1 - 60 days. We've done some research, and found that projects lasting any longer than 60 days are rarely successful.
When planning your campaign we recommend setting it to run for 30 days or less. We’ve found that campaigns with shorter durations often have higher success rates, and create a helpful sense of urgency around your project. When setting your campaign’s duration in the editor, please keep in mind that you will not be able to adjust the deadline after your project has launched.