GENCON94上是这么规定的，具体的看合同：

Demurrage
Demurrage at the loading and discharging port is payable by the Charterers at
the rate stated in Box 20 in the manner stated in Box 20 per day or pro rata for
any part of a day. Demurrage shall fall due day by day and shall be payable
upon receipt of the Owners' invoice.
In the event the demurrage is not paid in accordance with the above, the
Owners shall give the Charterers 96 running hours written notice to rectify the
failure. If the demurrage is not paid at the expiration of this time limit and if the
vessel is in or at the loading port, the Owners are entitled at any time to
terminate the Charter Party and claim damages for any losses caused thereby.