In reply to highaltitudebarista: I’ve done it before. Door to door in central london in around 48 hours.
Fri night, London City Airport flight to Geneva. Cham Bus (or something similar) to Chamonix. Saturday, first cable car up to Midi. Acclimatization/warm up climb, felt very miserable afterwards. Early check-in in Torino Hut, slept off the headache for 12 hours or so. Sunday, wake up at 3am, did the Rochefort Ridge. Back in town by around 2pm or so, Cham Bus back to Geneva, flight back to City Airport, etc.
Worked for me on AD climb, not sure about people climbing at higher standard.
Sleeping the first night at altitude rather than in Chamonix town would have probably worked better.