Generally, all guest can stay for at least 1 week and maximum 2 weeks. This is applied to all retreat in general.
It is also possible to come for a day (not to stay in Plum Village) for the Day of Mindfulness (DoM) every Thursday and Sunday, read Day of Mindfulness for more details.
If you want to stay longer than 2 weeks, then you are required to write an aspiration letter with your motivation and also included how many weeks you want to stay longer, The community will based on your 2 weeks practice and aspiration letter to make decision. Aspiration letter is not required for Summer Opening Retreat.
For more details about staying longer in Plum Village then you are welcome to read Extended Stay.