Game Help:Sims 3 Visa Level
From SimsWiki
visa levels are needed to be able to gain more days to stay in vacation the higher level you have the more you can stay on vacation
no visa points/lvl 3 days visa lvl 1-5 days
visa lvl 2-8 days
visa lvl 4-10 days
visa lvl 5-12 days
to gain visa levels you need visa points which you will gain when completing adventures