Is there really no way to forward an internal TLD with BIND without sticking `rndc nta -lifetime 2d <tld>` into your crontab? Because this is ridiculous. Yes, I know I'm hijacking a nonexistent TLD for local use. Everyone does this with authoritative zones. Let me use forward.
Bueno, en vez de indicarle 2 días, podrías darle hasta un máximo de una semana según la documentación: "The default lifetime is configured in named.conf via the nta-lifetime option, and defaults to one hour. The lifetime cannot exceed one week" 