Díaz, J. Casero, I.C. Megías, C. JACoW Publishing Geneva, Switzerland This article presents the timing system design of the IFMIF-DONES facility, which aims to develop materials that can withstand the harsh conditions of a fusion reactor while maintaining their structural integrity and functional properties. A key goal is to achieve high availability, which requires strong resiliency and redundancy measures throughout the plant design. The timing system design starts with a master clock composed of a stable master oscillator combined with GNSS receiver and clock disciplining equipment. They generate a local time scale and reference frequency with high stability. Three different Ethernet-based protocols are then combined, including NTP, IEEE-1588-2008 & 2019 High Accuracy profile (White-Rabbit) for time transfer purposes. NTP is used for generic computers and industrial devices that lack significant timing constraints, while IEEE-1588-2008 is used for industrial devices that require 1us accuracy or better. Both techniques can be implemented using off-the-shelf equipment and operate well over networks with moderate bandwidth utilization. The White-Rabbit protocol is used for devices that require highly accurate timing and can achieve sub-ns accuracy. It is typically designed for small, dedicated networks for timing only. This contribution describes the design of this timing system, highlighting how the best trade-off between cost and performance can be achieved through Ethernet technologies and how resiliency methods are implemented.