An estimate of how much work a fix takes — quick (under an hour), medium (1–4 hours), or major (1–2 days).
Alongside severity, many findings carry an effort estimate so you can balance impact against the work involved. Quick is under an hour, medium is a few hours, and major is a day or two.
Effort and severity together help you find the smartest order of work — especially the high-impact, low-effort fixes called quick wins.
What to do about it
Look for findings that are high-severity but low-effort first — they're the best return on your time. Save the major-effort items for when the quick wins are done.