How long does Jackson think people should stay in government jobs/positions? Why?

About five years, he went into the govt. tearing down any and all corruption leaving only the good.

Jackson took office with great expectations to cleanse government of corruption and restore the nation's finances. Washington's elite feared that Jackson would fire everyone that held government positions, even the competent, and replace them with his own people. Although Jackson replaced only about ten percent of the government officers he held power over, it was a high percentage compared to his predecessors.