Many of the routes to climb Mont Blanc take around 2-3 days, but you should plan to arrive a few days before your ascent to acclimatise to the altitude.
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Very high altitude is 3650m and above. As the altitude increases the concentration of oxygen decreases. Mont Blanc at 4807m is in the very high range. What this means for you on mont Blanc is that it is difficult to get enough oxygen into your body as you ascend the mountain.
Climbing Mont Blanc typically takes around three days. It is possible to summit with no technical mountaineering experience, but a very good level of fitness, strength and mental resilience is required - as is an expert local guide (unless you have extensive mountaineering experience).
You absolutely MUST have solid endurance fitness to do this (mountaineering experience not required) If you are overweight you will almost certainly fail. You could try our North Wales based MONT BLANC TRAINING WEEKEND to get the best idea of what's required.
In short: yes, it's too dangerous to try climbing Mont Blanc unguided with the experience that you and your fiance have, including the course you mention. Far too dangerous in fact. I recommend to either hire a guide or get more experience first. It's not so much the altitude that worries me.
Yet, when searching online for the world's most technically challenging mountains, Mont Blanc rarely even makes the Top 10. Instead, you'll find peaks in the Himalayas, like K2, Annapurna, and Everest, or Denali, the tallest mountain in North America, known for its rugged isolation and crippling temperatures.
Mont Blanc Massif has the highest peak in all of Europe. People die every year due to the high altitude and rock slides, making it arguably the most dangerous mountain to climb. There have been dozens of deaths every year. The total number of fatalities is between 6,000-8,000.
One of the big challenges is altitude. On top of this, given the glaciated conditions of Mont Blanc, you will also need experience using crampons and ice axe. Due to the possibility of encountering crevasses, all guided parties will be roped.
COLD INTENSIFICATIONIn the Mont Blanc massif, temperature decreases from 0.33 to 0.91°C every 100 m in elevation. The feeling of cold is highly intensified by the wind: it is the « Windchill » effect. At the summit of Mont Blanc, a temperature of -15°C without wind corresponds to -30°C with a 60 km/h wind.