Finding the last modified timestamp for a group of Models

I have an application which contains more than one Model, all descended from an abstract one. All the operational Models have created and modified fields with datetime timestamps. [How] can I get the Django ORM to bring me the last modified timestamp that will be the maximum of all createds and modifieds of all Models? Right now I have to use itertools for a quite convoluted expression over query sets of all the models involved.

It seems quite an obvious use case, and it can be implemented in pure SQL quite easily.

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