How long does it take for the processor to complete the cycle?

• A. 13 hrs
• B. 2 hrs
• C. 24 hrs
• D. 6 hrs

Answer: (A)

In histology, a full processor cycle is the total time needed for tissue to move from fixation through dehydration, clearing, and paraffin infiltration. Each step requires enough time for solvents to exchange and for the tissue to be properly penetrated by the next reagent, and the instrument’s program adds these durations together. For routine automated processing, this total is typically around half a day, about 13 hours. Short cycles like 2 hours wouldn’t allow all steps to complete properly, and 6 hours usually isn’t enough for complete dehydration, clearing, and infiltration. A 24-hour cycle could overexpose tissue to reagents and slow throughput, so 13 hours is the best fit for a standard processing cycle.