The difference between direct and indirect supervisor is the presence of the supervisor. Direct supervision means a supervisor is psychically present.
When mailing a certified letter, a person should expect it to take from three to five days to reach its destination. Depending on how long it takes the recipient to pick up the letter, the process can take up to 21 days. People who send certified mail receive a notification to prove that the letter has been received by its recipient.
When you send a return by mail, you have no way of knowing if the IRS received your return unless you pay extra for certified mail with a return receipt. It could take weeks for you to get that receipt. But if you file electronically, the IRS notifies you by email within 48 hours that it has received your return. And if the IRS detects any errors, it will send an error code that TurboTax will translate into a text message telling you what the problem is, how to fix it, and how to retransmit your return.