White polished rice uses a ratio of 1 part of rice to 2 parts of water. However, Jasmine rice uses 1 part rice to 1 1/2 parts water.
Usually, 2 cups of rice will take about 15 minutes to fully absorb the liquid. Then, the longer you leave it, the softer the rice will become. But, leave it too long, and the rice will end up being mushy.
Always check the package instructions. To what extent the rice that has been processed will also affect the cooking time.