If you have been to the Client lately you will see that the Retail is a "nation" of culture diversity. Speaking Spanish is a language that is a diverse language itself. The Client want to know if the Retail is fulfilling the needs of all its customers. I did the shop in English for $100, which was a no brainer. I should let my Grandson whom speaks Dominian perform the next shop or my Granddaughter whom speaks Portuguese. They both could use the $200
Speaking Manadarian Chinese is also a high paying shop.
Where is Rosetta stone when you need it
As for the amount of work, no more than performing the shop in English. It is a shop performed in Spanish. The Client should gives you all the paperwork and forms in Spanish, which you have to upload.