DefaultTTL

DefaultTTL sets the TTL for all subsequent records following it in a domain that do not explicitly set one with TTL. If neither DefaultTTL or TTL exist for a record, the record will inherit the DNSControl global internal default of 300 seconds. See also DEFAULTS to override the internal defaults.

NS records are currently a special case, and do not inherit from DefaultTTL. See NAMESERVER_TTL to set a default TTL for all NS records.

dnsconfig.js

D('example.com', REGISTRAR, DnsProvider('R53'),
  DefaultTTL("4h"),
  A('@','1.2.3.4'), // uses default
  A('foo', '2.3.4.5', TTL(600)) // overrides default
);

The DefaultTTL duration is the same format as TTL, an integer number of seconds or a string with a unit such as '4d'.