I have a 300km, 5,550m of ascent ride in June. I plugged this race into TR to build a custom plan but I am concerned the only option I had was to input my race duration, not distance or ascent or any mention of terrain.
I set my plan to ‘aggressive’ and it seems to have scaled by my training from what I was previously following How well are the custom plans designed? Should I not rely on this plan?
Hey @IronMurrKat 
That’s correct. For the event you only need to input the estimated duration you think it’s going to take you to complete the event and the intensity of the race effort. When you calculate how long this event might take you, you can take into consideration the distance, elevation, etc… but TrainerRoad does not need these specific metrics to create the plan to targets the correct energy systems needed to complete your event.
More info on how we build plans here: How TrainerRoad Builds Custom Training Plans for You
As far as the Training Approach (the aggressive setting you changed), this is a separate things. More info here: How to Adjust Training Approach Overall and by Zone