Happy to help!
In an ideal world, everyone would achieve an Event Readiness of 1 for their races/events. However, most of us have other commitments in life that might prohibit achieving a 5-star training status in preparation for a 30 hour race!
This is why we created a range of values for Event Readiness, where the ER value represents how long Xert expects you to be Red Star/Very Tired status afterwards. In your case, Xert expects you to be red status for 4.1 days after your event. Decreasing your ER value (to 1.0) means that you’ll be back to ‘Fresh’ status sooner after your race, but that requires you to achieve a higher Training Load going into your event. It also means that you’ll likely have higher durability during your event. I elaborated on that a bit more in another forum thread, here: How Are You Using Xert’s Forecast AI Training Plans? - #15 by ManofSteele
TLDR: It’s pretty obvious when you think about it… to be better prepared for your event, you need to train more! 
Xert just tries to provide more specific values for how well-prepared a user might be.