Here I am going to post the itinerary of each training course I have done (with a very brief description). Started more or less 1 month prior departure, I did one "long" ride each week in addition with daily short rides home-work and work-home, which account for 30 min per day for 2 months.
To note that this summer is particularly hot with an average of 32 degree in July, sometimes reaching 37 and even 39 degrees.
Geneva-Pampigny (60 km, achieved in 4h15): comfortable morning ride with low denivellation
Yverdon-Neuchâtel (40 km, achieved in 2h30): first training... first painful but.
Geneva-Sillingy (45 km, achieved in 3h30): Exhausting due to heat (33 deg) and high denivellation. Sweat in the eyes ... Worst thing ever...
Préverenges-Les Bouix : 40 km, 1 col (1180m), achieved in 3h: Rain, wind, cold weather... Found out my bag was not completely waterproof. A test from the beginning until the end!