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Even for external DNS the recommendation is 1 hour. See <a href="https://support.office.com/en-gb/article/Create-DNS-records-at-any-DNS-hosting-provider-for-Office-365-7b7b075d-79f9-4e37-8a9e-fb60c1d95166" rel="ugc">https://support.office.com/en-gb/article/Create-DNS-records-at-any-DNS-hosting-provider-for-Office-365-7b7b075d-79f9-4e37-8a9e-fb60c1d95166</a><br />
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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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 [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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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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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?

Office 365 DNS TTL

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.