6-9 hours in summer, 8-12 hours in fall, 11-16 hours in winter.

The above time is not absolute depends on the degree of dryness and wetness of the beans, if the beans are dryer can be extended appropriately.

Soybeans have cancer prevention effect of five substances:

Protease inhibitors; inositol hexaphosphatase; phytosterols; saponins; isobrass.