I have absolutely no racing experience. For the past few months, I have done multi-day tours of up to 5 days and 600 km, as well as tours without sleep over 500 and 600 km. But that was only on the paved road.
I modified my old Felt F35R road bike a bit. 28 mm and 25 mm wide tires, 20mm travel in the stem and a handlebar with wide drops.. For a gravel race certainly suboptimal and with 10 kg not that light, but as a fun and adventure bike a good and sporty all-rounder.