Jorge,
6.3 grams Sodium Carbonate (monohydrate) in 1 liter water, add 10ml solution "A", and off you go! That's the Sodium equivalent of 1:1:100. The Sodium Carbonate is easy to get as cleaning supplies (that's how I buy mine).

My last negs were developed in 4 weeks old sol. A, so it doesn't age too fast when stored properly. Given the light leaks in my darkroom I develop by inspection, so I have no idea about the times except that it was more than six minutes. The "Nameless Stream" in the critique gallery is from one of those. The shadows are very thin, but I didn't want the water to get too bright. SBR was about 3 stops.