- disorganized workplaces run by a paranoid manager (all too common): The tactic would probably be conceived as taking too much own initiative, and 'stealing' 30 minutes from an arbitrary number of employees would not go down well (even if it was in your free time). You could try and get managerial sign-off, but don't count on it. If you really need that job in the first place (it's going to be a rough ride) better do over a beer or similar. It is why 'after work' was invented in the first place after all.
- as a very junior or entry-level employee it would seem like overkill in most teams, and probably not work to your advantage. In that case, and if you're ambitious and want to move quickly, try to get the same information but in a less overt way.