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> After a few seconds, the longed-for rectangle arrived.

Another way to describe it would be a long-four rectangle :)

A furlong for a longed-for long-four won't last for long.

I think you mean a furlough. A furlong is 1/8 of a mile.

No, the wordplay works with variations of the words "for" and "long".

The "furlong" etymologically means a "furrow length" which is what you could call that spot everyone sets up for the narrow tetris block.