Donors can contribute to the fund as frequently as they like. It is then at the donor’s discretion when grants will be made to their chosen charities.
A donor-advised fund is a little like a personal charitable savings account. The accounts are controlled by a nonprofit, called a sponsoring organization that invests the assets and manages the donor’s account. Once a fund is established, donors tell the sponsoring organization to which nonprofit(s) they wish to donate from their account.