Visa processing times varies depending on the type of visa or the circumstances of the applicant. Generally, it takes between a few weeks to several months to get a decision.

As, individuals who have been denied a US visa in the past can reapply, but they must address the reasons for the previous denial and provide any additional documentation or information requested by the consular officer. It's essential to thoroughly review the reasons for the previous denial and ensure that the new application addresses any concerns raised by the consular officer.

The documentations needed generally depends on the visa you are applying for. Usually, you need a valid passport, completed DS-160 form, a passport-sized photograph, proof of payment of the visa application fee, and any supporting documents relevant to your specific visa category such as letter of acceptance, employment letters, or financial statements.