From the time you send the letter through InmateAid, expect it to reach the facility's mailroom within two to three business days via USPS. InmateAid processes and mails letters daily, so once your order is placed it goes out quickly from their end.
The Terre Haute Federal Correctional Complex, including the Satellite Prison Camp, is a well-established federal facility with a functioning mail operation. Once the letter arrives at the mailroom, staff inspect all incoming mail for contraband before distributing it, which is standard procedure at every federal facility. In most cases that inspection happens the same day the mail arrives and the letter goes out at that day's mail call.
So from start to finish, your son should have the letter in his hands within three to five days in most cases, sometimes sooner depending on postal routing and where in the week the letter arrives relative to the facility's mail call schedule.
The satellite camp operates separately from the main penitentiary complex, so make sure the address on the letter correctly identifies the camp rather than the larger FCI complex. InmateAid's system should have the correct address on file, but it is worth confirming your son's exact housing designation is entered correctly in your account to make sure nothing gets misdirected between the different units on the Terre Haute compound.
If your son does not mention receiving it within a week, reach out to aid@inmateaid.com and InmateAid will look into it and resend at no charge if needed.