The sentence is usually several years.

Legal analysis: those sentenced to public surveillance, criminal detention or fixed-term imprisonment shall not be less than half of the original sentence; Sentenced to life imprisonment, not less than thirteen years; If the death sentence is commuted to life imprisonment after the expiration of the suspension of execution, it shall not be less than 25 years, and if it is commuted to 25 years after the expiration of the suspension of execution, it shall not be less than 20 years.

Legal basis: A criminal sentenced to public surveillance, criminal detention, fixed-term imprisonment or life imprisonment in Article 78 of the Criminal Law of People's Republic of China (PRC) may have his sentence reduced if he consciously abides by prison regulations, accepts education and reform, and shows repentance or meritorious service during the execution period; One of the following major meritorious deeds shall be commuted:

(a) to prevent others from engaging in major criminal activities;

(2) reporting major criminal activities inside and outside the prison, which is verified by investigation;

(three) there are inventions or major technological innovations;

(4) sacrificing oneself to save others in daily production and life;

(five) outstanding performance in resisting natural disasters or eliminating major accidents;

(6) Having made other significant contributions to the country and society.