Dear,what ever profe. in your visa you have to work at wish of your employer.you do not arabic(?)so you can not work as represntative(Mandoob)your visa is for work so you can not sing a song on dune(!)five years means if anything adverse not happen you can work upto five years,after it your employer and govt (of caurse Allah) approve, you can stay more.This is multiple five years visit to this country to work with (under)your sposor.
Have nice jail.