CPR 3.8(4) provides: ‘In the circumstances referred to in paragraph (3) and unless the court orders otherwise, the time for doing the act in question may be extended by prior written agreement of the parties for up to a maximum of 28 days, provided always that any such extension does not put at risk any hearing date.’ Based on this provision, parties may agree to an extension of time up to a maximum of 28 days from the date of service of the witness statement, subject to the need to avoid risking any hearing date. There is no express exclusion of multiple extensions of time so it would seem that the parties are entitled to agree to any number of extensions up to a maximum of 28 days, provided they are otherwise made in accordance with the CPR, in particular CPR 3.8(4). For further information, see Practice Note: Agreements to extend time under CPR 3.8(4)