You don't have to set a deadline for your campaign
to reach your goal, which should be a specific financial amount for a concrete result. Experience shows that public attention to your goal changes over time. That's why you should take actions such as announcing a new goal. In principle, your campaign never ends. It will have active phases when you'll reach new goals, and less active phases. How long these down phases last depends on you, your resources and the dynamism of your project. You'll receive the most attention at the start of your project when you introduce yourself and your idea.