Workflow "add time" bypasses Tempo limits

[Markos Stefanou]

So this came up last week.

We are only allowed to declare 8 hour workdays normally. In some project, the user is requested to add time when he closes the issue in a workflow function where he enters the time spent in the issue. The problem is, the workflow entry of time spent bypasses the limits and, as we saw last week, a user may actually write that he spent 40h in a single day working on an issue and Tempo doesn't flinch.

Any idea on how to stop this from happening? 

I thought about checking the workflow and blocking users from adding more than 8 hours but if he already has a few hours declared in TEMPO, these 8 hours would be added to anything already preexisting.

Any ideas?