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Tapering trades volume for freshness. Meta-analyses point to a two-week taper cutting volume 40-60% while holding intensity, which typically produces a 2-3% performance gain. From 60 km a week that means about 42 km in the first taper week and 30 km in race week, with the same quality sessions at reduced length.
Race week volume
volume = normal x (1 - total reduction)
Weekly step
reduction per week = total reduction / taper weeks
This is an estimate from population-average equations, not a medical or diagnostic assessment. Individual results vary with genetics, training history and technique. Seek advice from a qualified coach or clinician before making significant changes to training.
Because cutting intensity causes rapid loss of neuromuscular sharpness. Volume drives fatigue; intensity maintains fitness.
Roughly one week for a 10 km, two weeks for a half marathon and two to three weeks for a marathon.