@Bryce probably has recommended the best TR training progression for you. However, while I have never done a 24hr event, I have done plenty of GFs with 10kft+. The thing you I believe that you need to include in your training plan is regular (weekly, if possible) long rides (6hrs+, if possible). This serves multiple purposes, including physical and psychological adaption to ultra-endurance riding and developing/dialing in your nutrition plan.
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