According to Alma Mukanova, vice-minister of justice, if Kassym-Jomart Tokayev won the upcoming presidential elections, he will be able to stay in office until 2029. However, this would be possible under specific conditions only. As the official said, another change in the Constitution might be needed to achieve that goal.
Under the current legislation, President Tokayev is serving a five-year term with the next presidential elections in 2024.
In order to stay in office until 2029, Tokayev has to win the upcoming elections, which is quite obvious. Also, the parliament must issue and approve the proper legislation before the elections.