How to store variable timedeltas in a Django model?

Hello all,

In one of my models, I want to store a timedelta--a length of time not
tied to a particular start and end date. Although timedeltas are built
into Python, tragically there's no TimeDeltaField in Django.

Extra complications:

* The timedelta can be quite large -- on the scale of one week to
several months.
* The timedelta has a default value, but it can be changed by the
administrator.
* I want the default timedelta length to be one month (which, of
course, has a variable number of days!)

It seems like *someone* has to have been able to do this, if only as a
custom model field. But I wasn't able to find anything in the archives
on this list and the #django IRC logger down so I couldn't search
that. :/

I did read the docs on how to write a custom model, but it looks
terribly confusing--it's not clear which or how many of the attributes
mentioned in the docs I would need to customize, given that it *is* a
built-in Python variable type, and I have exactly zero experience
dealing with databases directly.

If anyone's got a hack around this limitation to recommend, or even
some more relevant sample code than what's in the custom model docs,
that would be super helpful!

-- Karen

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