The best option in this specific case is a direct turnaround if you have room and a clear track for it. If you do a direct turnaround for 300, you might get by with 4x60 rather than 5x60 because of the extra accels (if they’re fast enough) but when using 90sec breaks, I’d stay with 5x60. You can always be creative depending on the athlete and your specific requirements and the SPP time available.