I was trying to locate the original post and went back about 30 pages - couldn't find it so the OP may have deleted it. I think it's useful for people still going through the process. Again, credit goes to the original poster whoever you are.
General Interview Timeline/Process
Application to first interview call - this is the broadest range. Some people heard the same
day, others heard back 6 months later. The call is generally 10 minutes with a recruiting screener.
They will ask a few questions and will schedule you for the second interview while on the phone.
The screener may give you his/her phone number.
First interview to second interview - the second interview is usually scheduled during the first interview call and is within a week after that call, and you'll get a confirmation email. This interview is done via HireVue video call or FaceTime. Not sure if Skype is still being used. The second interview is done with your assigned recruiter. Note that recruiter's name in the confirmation email. The recruiter's email address should also be in that confirmation email. This interview will be more in-depth questions and some role play scenarios.
The recruiter may tell you at the end of the interview they'd like to move forward and you'll receive an email to schedule the third interview. Or they may tell you that you'll hear back within some time period. Some people have heard back after a week that they want to schedule the third interview. If you're not selected to move forward, generally you'll get an email within that week.
The third interview scheduling email contains a link to page where you can select from available dates and times for that interview based on the interviewing manager's schedule.
Third interview to hiring offer pending BGC - The third interview is conducted by a hiring manager and will be some of the same questions as the second interview and similar role plays also via HireVue or FaceTime. The manager will not give you status at the end of the interview, but they will say that you'll hear within 1-2 weeks. This is one of the hardest phases to wait out. If they make an offer it will be via phone. If you're not selected, they'll notify you via email. Some people have received the phone call or email 3 days after the interview, others up to a week later.
Offer pending BGC to BGC email - The BGC email contains a link to the HireRight website to complete the background checking forms, which start the process. If they've made you an offer pending BGC, generally they'll say you'll get the email within 24-48 hours after the call. Some people have received theirs within a few hours, others a couple days after the call.
BGC completion to official offer call - The timeframe to get the BGC completed is so different for everyone, but generally within 7 business days after you submit the HireRight form. After the BGC report status is complete and you can see the Adjudication Status on the report, generally you'll get the official offer call within 2-5 business days. The offer call will confirm your start date, pay rate, and shift.
Official offer call to welcome email - This can range from a few days to a couple of weeks, and seems to be dependent on the starting date. That email will also tell you when your paperwork package should arrive. This will contain the official welcome letter, employment forms, and benefits information. I've read here that it's overnighted. It will also contain info about signing up for a paperwork online session. I don't know about you guys, but I'm going to frame that welcome letter!