This happened to Diana , and after a cup of coffee she took the cable down. After putting my crampons on I went for a walk on the glacier. Most of the climbers around me looked much clumsier than me, although my hand hadn't been holding an ice axe for more than 10 years. At that moment I knew that I would attempt the climb, possibly even setting off the next day. Food in Savoy is excellent, take your time to enjoy it if you happen to be there.
Mt. Blanc is typically a two day climb.
On the first day one makes the approach and stays in a refuge, after which one usually starts in the middle of the night trying to make it to the summit and back down to a village. There are two refuges where one can spend the night on the standard route. The better option is the higher one called Gouter Hat, at 3817m. The alternative is to stay at the lower refuge at Tete Rousse at 3167m. What makes both options quite different is that the mere 650 vertical meters between the refuges are mostly cliffs, which are technically the most difficult part of the climb, and if one starts from the lower refuge, one has to climb them in pitch darkness of the night.