Consular section at your nearest embassy or high commission. For UK nationals, India has outsourced its visa application services to VFS Global (www.vfsglobal.com); all applicants must make an appointment to visit an application centre in person. In the USA, India’s visa application services are handled by Cox and Kings Global Services (www.in.ckgs.us).
Government authorities usually impose administrative entry restrictions on foreign citizens in three ways - countries whose nationals may enter without a visa, countries whose nationals may obtain a visa on arrival and countries whose nationals require a visa in advance. Nationals who require a visa in advance are usually advised to obtain them at a diplomatic mission of their destination country. Several countries allow nationals of countries that require a visa to obtain them online.
H-2B temporary skilled and unskilled workers: Depends on the labor certification and the proposed period of employment, plus a period of up to ten days before the validity period of the H-2B petition begins and ten days after it ends. Initial maximum of 12 months, with extensions of up to a year possible, limited by an overall maximum of three years.
You need a valid passport before applying for a visa. The visa application process may take several weeks and generally must be completed before leaving home. For many countries the application and fee is the same for either a tourist or transit visa. A typical process for obtaining a visa is to complete an application and send it to the country’s embassy along with your original passport, a passport photo, the required fee and any other required documents. Additionally a transit visa application may require documents that verify that you will in fact be leaving the country within the required time period. Each country’s unique visa requirements are found online or by contacting that country’s embassy. Some countries like Colombia, Japan and many European countries do not require a visa for shorter stays.
If Customs and Border Protection (CBP) authorizes your admission to the United States at the designated port of entry, you will receive a stamped Form I-94, Record of Arrival-Departure. If you wish to stay beyond the time indicated on the Form I-94, you may apply for an extension by filing Form I-539, Application to Extend/Change Nonimmigrant Status, with USCIS.
In general, to obtain a visa it will take four business days. To get a visa in 2-3 business days you can apply for the Express Service (it costs an additional 20 USD); while to get a visa within one business day you can apply for Rush Service (which costs an additional 30 USD). Note that the Rush Service is granted only in documented cases of extreme urgency.