"Usual levels of C reactive protein in blood is less than 5 mg/L. Within 4-6 hours of the inflammatory stimulus, secretion of CRP starts rising, which doubles every 8 hours and peaks within 36 – 72 hours, and returns to normal around 3 days after the stimulus settles down. "
crowmom33, if you have autoimmune disorders, the timeline can differ with the immune response.