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Keep total and answering time distinct
With a 240-minute block and 20-minute reserve, 220 minutes remain for answering. Dividing 240 by question count measures the whole-block average; dividing 220 measures the selected answering average. Neither operation changes an official content duration.
Inspect the trade-off you chose
Increasing the reserve leaves less answering time. The calculator rejects a reserve equal to or longer than the block because the selected record has no positive answering portion. A zero reserve is valid arithmetic but does not claim that review is unnecessary.
Use compatible practice units
The tool counts questions. A vignette set can contain several questions or written tasks, so do not treat one set as one equivalent question without a stated practice interpretation. Track set-reading work separately when needed.
Use the outcome to choose a next task
If the average looks unrealistic for a particular block, inspect the question mix and actual execution. A revised time allocation can support a rehearsal; it does not prove knowledge or predict the exam result.