How to Set the Message Sending Interval
1. Open WhatsApp Web at https://web.whatsapp.com/.
2. Click the paper airplane icon in the top-left corner to open the "Bulk Message Sender for wa" extension's main interface.
3. In the main interface, select the "Settings" tab.
4. "Sending Interval": Select the interval between sending messages here. (A shorter interval will allow you to send messages quickly in bulk, but a longer interval will reduce the likelihood of being banned by WhatsApp.)