The itinerary lasts 7hrs 00min, and has 3 steps.
London - Paris
The step from London to Paris lasts 2hrs 15min. You'll travel in a high-speed train.
Paris - Grenoble
The step from Paris to Grenoble lasts 3hrs 00min. You'll travel in a high-speed train.
Grenoble - L'Alpe d'Huez
The step from Grenoble to L'Alpe d'Huez lasts 1hrs 45min. You'll travel in a bus.