If he loses 30 seconds per km for the rest of this climb, 7.5 minutes, he'll be 18 minutes back, they'll make up some time on the downhill and flat, and leaves him with around 20 minutes for the second ascent and the downhill at the end.
I'm not sure they'll make up any time on the downhill or flat bits given the composition of the break. Alaphilippe (and Wout if he makes it) gonna be flying down it.
If he loses 30 seconds per km for the rest of this climb, 7.5 minutes, he'll be 18 minutes back, they'll make up some time on the downhill and flat, and leaves him with around 20 minutes for the second ascent and the downhill at the end.