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Ste_S-
100mi TT I seem to recall most people on TTF were saying they were around 80-85% so for a 'ride' I would expect to below that unless it's super hilly and you're smashing your NP up with crazy spikes. It's a bit personal but I'd probably start at 70-75% and see how it feels. If you're feeling fine half way, bump it up a bit, if still fine at 80mi then bump it up again. Then you will know next time to hit out higher or lower depending on how you felt first go.
That still should be pretty quick. If you just wanted to 'get around' then 50-60% and a few cafe stops for the LOLs.
hippy
Races or rides? %FTP varies a lot between 100mi TT and cruising around the lanes.
Frequency of fueling for me during a TT is ~30min but could be more frequent if counting drinks between gels/bars. On an audax it could be similar but is often 1hr because the food I'm eating is more substantial.