Hackers only need one unguarded minute. On average, you offer 60-150 days.
Software has vulnerabilities that provide hackers with the opportunity to steal data, install ransomware or sabotage your business. Criminal organizations and intelligence services are willing to pay a lot of money for vulnerabilities that (almost) no one knows about. Big bucks (or rather, cryptos) are paid for these zero-days on the so-called dark web, because they offer you an open backdoor just for you