The whole process up to an interview date took about 4-5 weeks. I took the home version of their postal service test during week one. I was then invited to take the proctored version of the test week 2. Received a passing grade on both tests. Was sent an email saying I had to take a background check with the USPS contracted verifying agency. Received another email letting me know that I had to set up a date to take a drug test within 5 days. Set up to take the drug test the next day. Waited about 10 more days(this was the longest part of the whole process thus far) until I was notified via email of upcoming scheduled interview date.