Which of the following is a good practice when sending follow-up emails?

Sending a follow-up after 24-48 hours is considered a good practice because it strikes a balance between being persistent and respectful of the recipient's time. In most professional contexts, this timeframe allows the recipient sufficient time to review and respond to the original email without feeling overwhelmed. It demonstrates your interest and urgency regarding the matter at hand while still being considerate of their schedule. This practice enhances communication effectiveness and fosters better relationships, as it shows that you value the recipient's input and time.