Hello Sebastian Talamoni,
We prefer to keep the Story estimate field flexible. Some teams like to estimate in hours, some in days, some in weeks and others use a more abstract point system. That being said, we have some plans to implement a system where the user can choose what units they wish to estimate stories in. For example, if the user picked 'Days' for a particular project then the word 'Days' would appear next to the estimate field of every story in that project.
As for what to do about it matching the Task's estimation units, we may need to have an additional estimation field on a story that is simply a summation of the Task estimates.
These ideas are not fully mature and are still in the discussion phases. But, would an implementation similar to this work for you? Do you have any other suggestions?
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