Earlier this week a Facebook friend alerted me to National Grammar Day (4 March or March fo(u)rth, geddit?) with a cartoon in which a woman says ‘Be super annoying in a convo in 4 words or less …’ and a man replies ‘4 words or fewer!’
Grammar isn’t about being annoying. It’s about being interesting, and about usage informing rules and not rules prescribing usage.
Prescriptivists state that less is used with uncountable nouns and fewer with countable nouns. But less with countable nouns is well and truly used. Google Ngrams shows that words or less has always been more common than words or fewer, peaking between 1920 and 1960, for some reasons to do to with international politics.
The complete list of results for ‘*_NOUN or less, *_NOUN or fewer’ (the top 10 results) shows: year or less, years or less, percent or less, hours or less, months or less, (per) cent or less, days or fewer, pupils or fewer, words or fewer, hours or fewer, persons or fewer, employees or fewer, years or fewer, dozen or fewer, number or fewer, words or less, pounds or less, percent or fewer, feet or less, days or less. Clearly, less and fewer are used pretty much interchangeably in this context, whatever the prescriptivists say. Maybe there is a slight difference: five years or less means any amount of years, months or days (treating time as continuous) while five years or fewer means four, three, two, one or zero years (treating years as discrete).
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