NetMail requests are submitted to be sent immediately and processed from the queue immediately, depending on the number of requests in front of it in the queue. The NetMail server typically sends the emails within 1 hour.
The only time there may be a delay is at times when the traffic of NetMail requests on the NetSolutions service is high, such as around the holidays and the end of the year when a large number of clients send bulk emails. During these peaks, it could take up to a day, or possibly longer, for the emails to be sent. There can also be Internet variables that might slow down sent requests or receipt on the recipient side that we cannot predict.