How long do DNS changes take to propagate?

When changing a record, it will take the length of the TTL (time to live) in seconds to expire before your new changes go into effect. You can set the TTL to any value before or after making changes to your records. Reasonable values for a static IP are anywhere from 12 hours (43200 seconds) to 24 hours (86400 seconds). Reasonable values for a Dynamic IP are between 5 and 120 seconds.