Del. Code tit. 12, § 3593

Except where circumstances justify a longer period, pecuniary gifts from an inter vivos trust which are payable as of the death of the trustor or another person, shall bear interest at the rate of 4 percent per annum payable from the trust beginning 13 months after such death, or, if there is a change of trustee as a result of such death, 13 months after the trustee first takes office as trustee following such death, until payment, unless a contrary intent is indicated by the governing instrument.