In T 2534/10, the chairman of the opposition division had proposed, late in the evening of the only scheduled hearing date, that the oral proceedings be continued the next day. Although the patent proprietor had objected to this proposal, the proceedings had been continued the next day, and both parties had attended. The board observed that the two months' notice to be given in summons to oral proceedings under R. 115 EPC met the parties' fundamental need to be able to plan for and estimate the likely course of those proceedings. They had the same need when it came to continuing proceedings on a calendar day other than that specified in the summons. Accordingly, a fresh summons had to be issued if proceedings were to be continued beyond the calendar day specified in the original summons.