How long does it take an email from an unrecognized email address to the most generic tier 1 support alias to reach a senior responsible engineer / l…

How long does it take an email from an unrecognized email address to the most generic tier 1 support alias to reach a senior responsible engineer / lawyer / executive given clear relevance to them?

What percentage of emails which an omnipotent, benevolent deity would route to a senior responsible engineer / lawyer / executive factually make it from tier 1 customer support to a senior responsible engineer / lawyer / executive?