How often does the boy milk the cows in a day?

Read the text and answer the questions.

Please meet my cows, Morena and Novela. Morena is two years old and Novela is five years old. Both of them produce milk every day. I milk them twice a day, in the morning and in the afternoon. Every day, Morena and Novela each produce about six litres of milk. They eat a lot. I feed them with grass and vegetables. I also feed them with cassava. I cut the cassava into small pieces. Morena and Novela eat almost everything I put in the container in front of them . They also need a lot of water to drink.

How often does the boy milk the cows in a day?