OBS_VALUE: Contractual services suppliers may apply either for a Visa V Asistencia Tecnica, a techincal assistance visa, or Visa V Prestador de Servicios, Obra o labor, a service, work or labour provider. Both of them allow holders to stay up to 2 years, but the visa for technical assistance has an extra rule: its holder may stay in the national territory for a maximum of 180 days, continuous or discontinuous, non-extendable, every 365 days from the issuance of the visa.