dnscontrol/documentation/functions/record/TTL.md

name	parameters	parameter_types
TTL	ttl	ttl Duration

TTL sets the TTL for a single record only. This will take precedence over the domain's DefaultTTL if supplied.

The value can be:

• An integer (number of seconds). Example: 600
• A string: Integer with single-letter unit: Example: 5m
• The unit denotes:
  • s (seconds)
  • m (minutes)
  • h (hours)
  • d (days)
  • w (weeks)
  • n (nonths) (30 days in a nonth)
  • y (years) (If you set a TTL to a year, we assume you also do crossword puzzles in pen. Show off!)
  • If no unit is specified, the default is seconds.
• We highly recommend using units instead of the number of seconds. Would your coworkers understand your intention better if you wrote 14400 or '4h'?

D('example.com', REGISTRAR, DnsProvider('R53'),
  DefaultTTL(2000),
  A('@','1.2.3.4'), // uses default
  A('foo', '2.3.4.5', TTL(500)), // overrides default
  A('demo1', '3.4.5.11', TTL('5d')),  // 5 days
  A('demo2', '3.4.5.12', TTL('5w')),  // 5 weeks
);