As @aksasin mentions you can always use Filter to change duration depending on how much time you can train today. Also consider Load More to display a wider variety of options including workouts with lower XSS/time requirement. They will all contribute to your training load as you progress towards your target event date.
You don’t need to make up a deficit from week to week as XATA is based on a rolling seven day period. Any deficit/surplus is absorbed into the following seven day period.
Ideally the pacer needle floats between 11am and 1pm to maintain the TL goal you established by setting the improvement rate (IR).
However. you might let the needle drop into the red during the week then bring it back up with a long ride on the weekend. Or a dip occurs due to unforeseen schedule conflicts (stuff happens). E.g., you may take extra days off one week, but you’re back to a “normal” the next.
If you consistently find yourself unable to maintain the current ramp rate (hours/week and intensity) you can adjust IR down under Goals. For example, change Moderate-2 to Moderate-1, or Moderate-1 down to Slow. Then dial it back up again if/when your schedule permits.
At some point everyone reaches a limit on what they can ride per week and you’ll need to change IR to Maintenance to hold it there or Taper to reduce the commitment. Or move to Off-Season and take a week off.
If you haven’t ridden centuries before, let us know and we can provide some additional tips.