A: Use the State Department’s Global Visa Wait Times page before making travel plans. It shows recent wait information for U.S. embassies and consulates around the world, including estimated visitor visa interview availability. Treat the number as a planning estimate, not a guaranteed appointment date. New slots can open, workloads change, and the posted interview wait does not include the time needed to adjudicate the visa or return your passport.
Source: U.S. Department of State Global Visa Wait Times: https://travel.state.gov/content/travel/en/us-visas/visa-information-resources/global-visa-wait-times.html