<prompt> Acute graft rejection occurs within?Few minutesFew hours6 months6-12 months  <response>: Hyperacute rejection: type 2 HSR, happens over span of few minutes to hours. Eg: kidney transplant Acute rejection: Few weeks to months 6 months Chronic rejection: After 6 months. Graft vs host disease Runt Disease: Acute GVH: 100 days Chronic GVH: 100 days 