Spanish term (edited): indemnizaci�n de 20 d�as de salario

Severance pay equivalent to 20 days' wages for every year of service (employment)

severance / "sev@r@ns / n [u]
a (of relations, links) ruptura f
b (Lab Rel) cese m; (before n) severance pay indemnización f por cese
Oxford Spanish English Dictionary (Superlex)

Severance pay is often granted to employees upon termination of employment. It is usually based on length of employment for which an employee is eligible upon termination.
http://www.dol.gov/dol/topic/wages/severancepay.htm

Although the Act does not define wages in lieu of notice or severance, the courts have generally defined severance pay to be a payment the employer has obligated itself to make, either verbally or in writing, which is based upon a length of service formula. For example, an employer may have a company policy that a terminating employee is entitled to one month's wages for every year of service. This is severance pay.
http://www.twc.state.tx.us/news/efte/final_pay_severance_ben...

Amount
The amount of the severance usually depends upon length of service, amount of compensation, level of employment, goodwill of the employer, and extent of possible claims against the employer.  Many companies pay a week or two of severance pay for every year of employment. 
http://www.job-law.com/articles/7312.cfm?vPage=7312

Cordial Saludo

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Note added at 13 hrs 32 mins (2003-10-26 12:58:44 GMT) Post-grading
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con mucho gusto
un feliz domingo