Ideally, you'll need to register at least 4-6 months before your desired departure date. Of course, short-term registrations of 1-2 months before departure are possible - but it may then be that your dream project is already full. In this case, we will try together to find a suitable alternative for you.
Lead time is especially important for the countries in which a visa has to be applied for in advance.
For medical projects as well as for internships, short term registrations are not possible.