If a volunteer wants to stay for a shorter period than what you ask on the platform and you guys are still at the pre-approval step of the process, it’s up to you to decide whether to accept it or not. Keep in mind that volunteers might have their own availability to travel, but you're the person that decides what’s best for your place and how much help you need.
Remember to change the pre-approval dates if you agree to host the traveler for a shorter period. :)
Most hosts set their minimum stay to two weeks. That is usually enough time for the volunteers to learn their to-dos and enjoy the esperience! If you need people for more time than that, you can choose a longer minimum stay. To do that, go to the menu at the top of the page of our platform's web version, click on “Volunteer Positions” → “Edit Position” → "Shift"→ “Stay for at least”.
If the experience is already happening, but you or the volunteer wants to finish it before the agreed time, there's nothing that stops you guys from doing that, just remember to change the departure date in order to make the calendar available and, if necessary, you can reach out to us so we can help you with that.