For this purpose it is necessary only a minimal amount of water of about 0.6 to 1.4% on the amount of concrete powder or in larger castings ratio 1 part of water and 4 parts of fine concrete (100 g water + 400 g fine concrete).
It takes 2- 3 days for hardening, however, it is very strong and stable and resistant to weather, breakage, abrasion and sweat.