Nigeria visit visa process:

Anyone who wants to visit Nigeria has to obtain a valid visa to enter the country. There are currently numerous types of visa options available depending upon the purpose of the visit. If travelling to Nigeria then one can also apply for the Nigerian visa online.

The Nigerian visa authority grants the visa permit. The visa allows a person to visit and travel across the nation or stay in the country temporarily, only if he/she visits as a tourist or for a business purpose. They can apply for a visa up-to three months prior to their estimated date of arrival in Nigeria.

PS: Tourist visas are granted to only those who travel to Nigeria for visiting friends and family.

Country-Specific Requirements: The passport holders of the ECOWAS nations, which comprise of the Economic Community of West African States, are exempted from the visa requirement to enter Nigeria. Travellers from these 14 nations – Benin, Guinea Bissau, Burkina Faso, Niger, Cabo Verde, Sierra Leone, Cote D’ivoire, the Gambia, Guinea, Togo, Liberia, Mali, Ghana and Senegal do not require a visa to enter Nigeria.

Visa Processing Time: The duration of the processing and fees for the Nigerian visa depends on the visa class for which an applicant applies for. It also depends on the nationality of the applicant and the time of the visit of the applicant. Generally, the Nigerian visa authority takes nearly 3 to 5 working days to process a visa application.

You can find more information through source link.