We estimate that it takes 1-3 business days for a letter to reach the mail room of a facility. Once the letter arrives, all mail is inspected by facility staff for contraband which may delay the actual delivery at mail call. Normal mail call days are Mon - Fri usually n the afternoon.
https://www.inmateaid.com/ask-the-inmate/how-long-does-it-take-an-inmate-to-receive-a-letter-through-inmateaidcom#answer
Accepted Answer Date Created: January 27,2014