This is - in part - answered when you click ‘Show Advice’. It’s related to recent activities you did the past Mondays, and will provide you with a surplus you need to stick to your plan/schedule.
After you have completed the activity, you will have a surplus, but it will be gone before the day passes…
Combination of how fresh you are + your usual training. If you don’t have 2 hours to train, then use the filter option and filter for workouts that are shorter in duration.
At the end of the day, remember that Xert is giving you recommendations… you’re always free to modify or choose a different workout based on perceived fatigue or time restrictions. Hope that helps!