How many days does the Spanish Embassy work on a...

you can contact the embassy to inquire about the fees and time taken through the following link:
Spanish embassies in United Arab Emirates

Kindly be noted that, to obtain a visit visa to Spain, Emirati citizens who hold a passport valid for no less than three months must apply for an ETIAS visa electronically on the Internet by filling out an application form contains the basic details required such as name, date of birth, nationality and marital status are entered.
Use the following link: -
BLS International   
Travellers will also be required to provide supporting documents within completing the online application. The information provided by travelers are checked through the ETIAS Visa Waiver App. Emirati travelers should be informed that there is a processing fee they have to pay in order to complete the visa waiver application process, paid by credit card. .
Once the traveler submits the ETIAS visa waiver application, it can be granted within a few minutes after submitting the application and the traveler will be responsible for printing an ETIAS visa to take it to the European port / checking-point of entry, and travelers then have to present the visa to European borders' officials to grant them the pass to Spain,
Required Documents
Two white-background photos,
A passport valid for at least three months from the date of arrival,
A copy of the first four pages of the passport,
A copy of the credit card or bank statement,
Medical insurance covering the whole period,
Travelling tickets photocopies,
Proof of having reservations of residence for the duration of your visit