Alhambratoday

No rhyme or reason to it  - some people get it within a week of landing, others it takes months. There are a couple of bottlenecks:
 
1. The Point of Entry - the speed with which they actually forward the materials to USCIS (CBP just receives them from you, and then sends them on the USCIS). Under the CBP's own internal guidelines, they process you into the country by stamping your visa, and then they complete a data information sheet (I-89), check your documents, and then mail the whole package to a USCIS service center for processing. They are supposed to conduct quality control to ensure nothing's missing before it goes out, however if something is missing (like an officer forgot to sign a form), it could get sent back to the Point of Entry, or just end up in an administrative black hole. Moreover, they won't affirmatively contact you if something's wrong, they wait for you to eventually (120 days after entry) contact them. 
 
2. The Service Center - there are 6 USCIS service centers (California, Vermont, Texas, Nebraska, Virginia and the National Benefits Center (Missouri) - they don't publicize which center gets forwarded the packages, but all USCIS service centers have huge backlogs these days. It could be the case that those that get processed quickly are those that happen to go to a service center that prioritizes them. In general, those entering the USA with immigrant visas have less of a need for a green card due to the one-year "temporary I-551" than people who adjust status in the USA. 
 
3. The Officer at the Service Center - the file requires data entry and review by an ISO (Immigration Services Officer), once signed-off on, it goes through a 72 hour hold period before it is sent through two different systems for actual card production. If there's any issue at any of these stages, the whole process can be delayed. 
 
4. Production/Mailing - there are two facilities that actually manufacture green cards - one in Missouri, one in Kentucky. These also manufacture work authorization cards, refugee travel docs, and ID cards for TSA employees. 
 
5. Mailing - the card can only be mailed to the address given at the Port of Entry, and the online address change process may not feed into the card production system. Getting a non-delivered green card replaced requires filing of another form (I-90) and that can take up to 12 months. 
 
 
 

No rhyme or reason to it  - some people get it within a week of landing, others it takes months. There are a couple of bottlenecks:
 
1. The Point of Entry - the speed with which they actually forward the materials to USCIS (CBP just receives them from you, and then sends them on the USCIS). Under the CBP's own internal guidelines, they process you into the country by stamping your visa, and then they complete a data information sheet (I-89), check your documents, and then mail the whole package to a USCIS service center for processing. They are supposed to conduct quality control to ensure nothing's missing before it goes out, however if something is missing (like an officer forgot to sign a form), it could get sent back to the Point of Entry, or just end up in an administrative black hole. Moreover, they won't affirmatively contact you if something's wrong, they wait for you to eventually (120 days after entry) contact them. 
 
2. The Service Center - there are 6 USCIS service centers (California, Vermont, Texas, Nebraska, Virginia and the National Benefits Center (Missouri) - they don't publicize which center gets forwarded the packages, but all USCIS service centers have huge backlogs these days. It could be the case that those that get processed quickly are those that happen to go to a service center that prioritizes them. In general, those entering the USA with immigrant visas have less of a need for a green card due to the one-year "temporary I-551" than people who adjust status in the USA. 
 
3. The Officer at the Service Center - the file requires data entry and review by an ISO (Immigration Services Officer), once signed-off on, it goes through a 72 hour hold period before it is sent through two different systems for actual card production. If there's any issue at any of these stages, the whole process can be delayed. 
 
4. Production/Mailing - there are two facilities that actually manufacture green cards - one in Missouri, one in Kentucky. These also manufacture work authorization cards, refugee travel docs, and ID cards for TSA employees. 
 
5. Mailing - the card can only be mailed to the address given at the Port of Entry, and the online address change process may not feed into the card production system. Getting a non-delivered green card replaced requires filing of another form (I-90) and that can take up to 12 months. 
 
 
 

Got interview letter today:
 
CONSULAR POST - BOGOTA, Colombia
 
Scan date: March 1
CC date: March 26
Received interview letter: April 3
Interview date:  May 10

Got interview letter today:
 
CONSULAR POST - BOGOTA, Colombia
 
Scan date: March 1
CC date: March 26
Received interview letter: April 3
Interview date:  May 10

Got interview letter today:
 
CONSULAR POST - BOGOTA, Colombia
 
Scan date: March 1
CC date: March 26
Received interview letter: April 3
Interview date:  May 10