How long does it take to receive a visa from the Chicago embassy and can I leave the USA during that time?

The user is inquiring about the visa processing time at the Chicago embassy, specifically asking how long it typically takes for applicants to receive their visas. They also want to know if they can travel outside the USA while waiting for their visa, excluding Thailand, and are seeking clarification on what "place of issue" means in relation to their passport, which was issued abroad.