DEAR MISS MANNERS: If I email a non-urgent, work-related question to my manager, how many business days are generally appropriate before I should expect to receive a response?
GENTLE READER: As many as your manager feels are needed.
Miss Manners says this in all earnestness -- but not because she recognizes that employees are seldom in a position to discipline their bosses for misbehavior.
Your work activities are done at the behest of your manager: Your work is their work. One assumes that the delivery of that work will, at some point, be delayed if no answer is forthcoming, but the decision to allow such a delay is the manager's.
This is not, it should be understood, an invitation to watch deadlines expire without further action on your part. One of the joys of being an employee is that you will occasionally have to nag your boss.