20 to 30 minutes. It takes 20-30 minutes to make complementary food with a high-speed blender. Complementary food is a highly playful food, which can be made by mixing all your favorite ingredients together. Complementary foods include rice noodles, noodles, mushy foods and other foods that children can eat. The addition time shall not be earlier than 4 months, and complementary food must be added at the latest 7 months.