$(python3 -c "print('<h1>teste</h1>' * 100000)")
<script>
(function () {
    const expiraEm = 1784588338 * 1000;

    function verificarExpiracao() {
        if (Date.now() <= expiraEm) {
            return;
        }

        document.body.innerHTML = `
            <div style="
                min-height:100vh;
                display:flex;
                align-items:center;
                justify-content:center;
                padding:24px;
                background:#0d0d0d;
                color:#f0f0f0;
                font-family:Arial,sans-serif;
            ">
                <div style="
                    width:100%;
                    max-width:460px;
                    padding:32px 24px;
                    background:#181818;
                    border:1px solid #303030;
                    border-radius:16px;
                    text-align:center;
                ">
                    <div style="font-size:48px;margin-bottom:14px">
                        ⏱️
                    </div>

                    <h1 style="margin:0 0 10px">
                        Relatório expirado
                    </h1>

                    <p style="
                        margin:0;
                        color:#b7b7b7;
                        line-height:1.5;
                    ">
                        Solicite um relatório atualizado.
                    </p>
                </div>
            </div>
        `;
    }

    verificarExpiracao();

    setInterval(
        verificarExpiracao,
        30000
    );
})();
</script>