The binding legal principles established are: (1) Where a statutory provision is declared invalid with prospective effect after suspension, and the suspension period expires, applications seeking relief based on that provision become moot if the applicant seeks only prospective relief from the date of final judgment (per majority). Alternatively, such applications are not moot because the court's power to declare conduct unlawful derives from section 172(1) of the Constitution and the principle of legality, not from the now-invalid empowering provision, and the declaration describes the lawfulness of conduct at the time it occurred (per concurrence). (2) Prospective invalidity orders are intended to preserve legal consequences of decisions made under the invalidated law, including causes of action, and should not be interpreted to render pending proceedings moot. (3) In considering whether to grant leave to appeal in circumstances where appointments are nearly expired, courts must weigh: the seriousness of the constitutional or legal breach; whether illegality is clearly established; the impact on service delivery and the public; the performance record of appointees; prejudice to parties; and the time remaining in appointments. (4) Organs of state must comply with statutory timelines and section 237 of the Constitution requires constitutional obligations to be performed diligently and without delay. (5) The reasonableness of delay in review proceedings must be assessed based on explanations actually offered by the applicant, not speculation by courts. (6) Unexplained or inadequately explained delays are unreasonable as a matter of law.