From: Götz Reinicke goetz.reinicke@filmakademie.de
I do have two DNS servers running bind 9.7.3. One master, one slave. If I add/update a record on the master, it takes up to more or less 20 hours until that change is transferred to the slave.
Maybe check the 'refresh' value...? See: http://www.zytrax.com/books/dns/ch8/soa.html
JD