The way up from El Rancho to La Cueva was quite ok, made it with bags in 3:30 hours. In next about two hours we were at Latas (4520 according to our GPS).
Next day in the clouds: were going to take the route on the right but did not find it - went through the classic route and made it to the top with no major problems (still one has to be VERY careful!!!) in about 3:30 hours - cloudy but warm.
At night our eyes started to hurt a lot, could not sleep at all, we did not see well for the next 10 days! Probably intoxication by the gases! Be careful!
For the detailed description of the routes by an expert see: http://rutadirecta.blogspot.com/ Enjoy!!!