Filter object by calculating duration from start and end time

Hi,

Given an object such as:

class Entry(models.Model):
  start = models.TimeField()
  end = models.TimeField()

I'd like to be able to say something like:

Entry.objects.filter(F('end')-F('start')__gt=time_in_minutes)

Is there a way of doing this without implementing a separate duration field and having a setter for start and end update it?

Cheers,
Steve

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