Hi, Native speakers often don't care much about the distinction between 'fewer' and 'less', particularly in casual English. In terms of casual English , all your versions below seem fine. Please answer each one.
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'No less than' is a funny example because it means more than.
When you say 'no less than 300 people showed up for the concert' what you mean is 'at least 300 people showed up for the concert'.
'In no less that 500 words' means 500 words is the minimum but 'in less than 500 words' means 500 words is the maximum.
Think about 'no more than'... 'no more than 5 people in the lift