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Maybe they don't want F1 cars lapping in under a minute. Honestly though, most any track under 2.0 miles isn't going to be that enjoyable, with the possible exception of Portland or something.
For international-level, Grade 3 circuit racing and up, the absolute minimum, unless there's a special exception, such as in the case of Lime Rock, the length is 3.0 km.
Also, with relatively few exceptions, road courses under 2.5 miles (~4.0 km) aren't usually up to full Grade 2 standard anyway, except for those of us here in NA with Mosport, Laguna Seca, Mid Ohio, Lime Rock, etc., plus our bevy of street circuits. You have a few in Europe, namely Sachsenring and Oschersleben, along with a few in Japan: Aida/Okayama and Sugo. I might also say that Eastern Creek passes muster, but around the world, that's about it.
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