In the case of specific project sponsoring, it is important to determine what in particular people want to support within such a project and for what period of time they want to do this.
In the case of a structural connection, links are placed back and forth so that a sponsor can advertise with both the project and the foundation if they wish.
In principle there is no minimum amount or minimum term, but it is obvious that a long-term commitment often leads to better results than a one-off donation, even though both are equally welcome.
