". . . if you can believe it" (2,4)

I think it could be either:

Which length description are you looking for?:

2,4

no less

(Other definitions for no less that I've seen before include "praise, ironically" , "Expression of admiration" , "Bare minimum" , "Phrase used to emphasise admiration or surprise" , "indeed!" .)

I've seen this clue in The New York Times.

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