well the processing time for a US visa in Nigeria can vary depending on a few things, such as the type of visa you’re applying for Generally, it can take anywhere from a few weeks to several months

For non-immigrant visas, like tourist or student visas, it often takes about 2 to 4 weeks from the date of your interview. However, this can be longer if additional documentation is required or if your application is subject to additional processing

For immigrant visas, the process can be more lengthy, often taking several months to over a year, depending on your specific situation and the type of visa

It’s a good idea to check the US Embassy in Nigeria's website