What is a sign that timing is critical in re-engaging customers?

The critical factor in determining whether timing is essential in re-engaging customers is the act of tracking if an email has been opened. When you monitor whether customers are opening your communications, it can indicate their level of engagement and willingness to interact with your brand at that moment. If an email is opened soon after sending, it suggests that the timing of the communication aligned well with the recipient's interest or need. This insight can inform you about when to follow up or adjust your strategy, ensuring that your approach resonates when customers are most receptive.

The other options do not directly relate to signs of critical timing for customer re-engagement. The availability of promotional offers is relevant but does not reflect a customer's immediate responsiveness. Sending emails regardless of preferences could lead to customer frustration rather than timely engagement. Lastly, only making contact during business hours may limit your ability to reach customers when they are most open to communication, instead of recognizing the specific timing that resonates with them.