On most eAlert setup screens, there are two fields called "Send eAlerts From" and "Send eAlerts Until." Enter the time range you would like your eAlerts to be sent. If an eAlert is triggered outside of your chosen time range, it will be sent the following day. If you would like to receive all of your eAlerts at a specific time every day, simply set "Send eAlerts From" and "Send eAlerts Until" to the same time, making sure to choose a time during normal business hours.
Daily Balance eAlerts work a little differently: instead of a time range, you'll choose a single "Notify Me At" time during normal business hours to be notified of your balance(s) once a day. If you'd like to be notified of your balances multiple times a day, you can set up multiple Daily Balance eAlerts, each with its own "Notify Me At" time.