(2) 日跨ぎ対応タイムアウト: Windows API GetTickCount を使用し、ミリ秒単位で安全なタイムアウト判定を実施（無限待機の防止）。 (3) UIフリーズ防止: Sleep と DoEvents を組み合わせ、レスポンスを待ちながらもExcel自体の操作性を維持。

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