Volunteers are people who offer their work on a voluntary basis. Currently there are many volunteers who want to support and help refugees here in Germany. Many of them also have a regular job and families and therefore can only work in their free time (unpaid). For these reasons they may have only limited time where they can offer their support and assistance. Our volunteers can provide you with estimates of how much time they can offer their support. 

The voluntariness is based on both sides, so you have a choice in the matter too! 

(vgl. Diakonie Deutschland Evangelischer Bundesverband Evangelisches Werk für Diakonie und Entwicklung e. V., What are volunteers?/what are voluntary workers?, 2016)