When you say submit, it depends on what part of the CE process you are talking about. They should notify the CE within 8 weeks otherwise they are time-barred - assuming it is one of the ones they are obligated to notify (where a PM has instructed a change to the Works Information these are not time-barred).
If it is the quotation process that has been delayed then they should assess it in accordance with 63.1 which would be forecast Defined Cost at the point the event was instructed, or for all other events when the compensation event was notified.
If it is the quotation process that has been delayed then they should assess it in accordance with 63.1 which would be forecast Defined Cost at the point the event was instructed, or for all other events when the compensation event was notified.