It's only 1000k so you can go harder and I assume the roads are pretty good quality (save maybe the climb). How much climb did you have on day 1 of TCR? Think this has 4500m but it's most that big climb in the middle. Could also have favourable winds. Still a strong ride.
That's more than I do for first 650km of tcr. Though this is shorter, so not paced the same. And perhaps flatter?