Audax events

Would be great if as a goal when creating custom event I could choose ‘not a race’ so the goal will train me to finish the event in best possible form in the time limit specified. Currently for example if I choose goal 6 weeks away that is 400km long with 27h limit and 3500m elevation , join recommends quite a bit of vo2max work what I do not think is good recommendation due to high recovery cost, short window before the event and effort almost not use in those events