20 to 30 minutes. When cooking vacuum-packed zongzi, you must boil the water first. After boiling, put the zongzi into the pot. The water is just over half of zongzi, and it takes about 20 minutes to cook. If the zongzi is very big and stuffed with meat, it is recommended to cook it for about 10 minutes, and it will be cooked in 30 minutes. Zongzi, a delicious food with glutinous rice as the main material and wrapped in zongzi leaves, is one of the traditional festival foods of the Chinese nation.