Five to seven days. According to the inquiry of Apple Green Health Network, it takes five days to a week for immunohistochemistry, one to two days for antibody staining and three to five days for comprehensive judgment. Immunohistochemistry refers to the application of the basic principle of immunology, that is, the principle of antigen-antibody reaction, that is, the specific combination of antigen and antibody, and the determination of antigens (peptides and protein) in tissues and cells by making the chromogenic agents (fluorescein, enzyme, metal ions and isotopes) of labeled antibodies develop color through chemical reaction, and then the localization, qualitative and relative quantitative research is carried out.