In reply to nation1:
Hi
I am planning this with my guide right now. We are looking at driving to Tasch from Chamonix early in the morning, then make our way over to Plan Maison by a series of cables and walks (looking into this detail now), then walk up to carrel hut for the night before attempting the summit and back down to Tasch.
We estimate:
Plan Maison to Carrel <6h
Carrel to Summit 5h
Summit to Solvay 2-3h
Solvay to Hornli 2-3h
Then take it from there after a rest and view back up the mountain!
Let me know how you get on with your research. Its good to have a sense check for this stuff.
Cheers,
Simon