It should take about eight hours for two workers in a professional garage to install such a kit, or less than a week for the car-owner himself/herself (or, as they say, two weeks if the owner’s spouse “helps”).
A dos trabajadores de un taller profesional les llevaría alrededor de ocho horas instalar el paquete y al dueño del auto menos de una semana (o, como dicen ellos, dos semanas si su cónyuge le “ayuda”).