Подскажите, льгота 50% сохраняется при смене работы?

а она сколько лет вообще предоставляется?

Да - нашла - The provision now applies to remuneration from employment in Cyprus, whereas previously it was limited only to the remuneration from the first employment in Cyprus. This amendment broadens the scope of the provision and allows individuals to qualify for the exemption even if they change employer within the period of 17 years. Thus, the provision would also apply to any subsequent employments within the 17-year period.