Three to five years. According to the relevant information of Meng Tiancai learning machine, Meng Tiancai learning machine can be used for 3 to 5 years. Learning machine is an electronic teaching product. It also refers to all electronic education equipment that has an auxiliary effect on learning. Learning machines can be divided into language learning machines, such as English learning machines, Japanese learning machines, Chinese learning machines, Korean learning machines, multilingual speaking machines and so on.