This TSS figure is just an estimated placeholder. I would not recommend using that as a goal of sorts for this ride. That figure does seem inflated and I’ll bring that up to the team…
The goal of these rides is to get a good hard ride in your legs. This doesn’t mean you need to ride hard the entire time, but we’re suggesting that you push a little harder than an Endurance ride and mix in some harder efforts (whether uphill or on the flat, etc.). Think Sweet Spot/Threshold efforts and/or some shorter, harder VO2 efforts. Mixed intervals are totally fine.
While you shouldn’t destroy yourself, you should feel like it was a good hard ride when you get back, similar to how you might feel after a hard indoor workout.
The trick here is not to go out too hard. Ease into it and build your efforts up over time. With this being a 3.5-hour long ride, you don’t want to cook yourself in the first hour.
Try not to overthink it. Just go out and get some efforts in your legs. You should feel tired when you return but not completely exhausted.