Office 365 DNS TTL

It seems that Office 365 only allows a minimum TTL of 1 hour for DNS A records. Is there any way to set a lower TTL?
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albatros99Asked:
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David AtkinTechnical DirectorCommented:
Not to my knowledge.  If you want it any quicker then you will probably have to use external DNS.

Note:
If you are using external DNS then office 365 won't check the TTL setting on the external DNS Server.  It will just check that the records exist.

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Robin CMSenior Security and Infrastructure EngineerCommented:
Even for external DNS the recommendation is 1 hour. See https://support.office.com/en-gb/article/Create-DNS-records-at-any-DNS-hosting-provider-for-Office-365-7b7b075d-79f9-4e37-8a9e-fb60c1d95166
For internet-accessible DNS names, there isn't much point in going lower than one hour anyway due to how long the propagation process takes. Even if you set it to 1 minute, all the DNS servers in the world aren't going to take any notice of this and you'll still find that some servers have the wrong IP address many hours later. Otherwise people could cause crazy DNS update storms by setting stupid TTL values and constantly changing the records.
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