The labour contract is capable of establishing a continuous relationship between the parties. However, this continuity might end due to a necessity. One of the main problems in terminating continuous labour relationships is that this initiative is carried out over a period of time in order to prevent loss of rights. However, this period can change according to the reasons (right or valid) affecting the will of the parties to terminate the labour contract. Sometimes it is necessary to move within the short period of time determined by the law, sometimes it may be necessary to move within an incident’s reasonable time. Undoubtedly, delaying this period may terminate our right to end labour contract without legal loss. In our study, the termination of the employment contract by the parties for justifiable or valid reasons and the durations of time to use their right will be discussed.