Can anyone advise more or less how long it takes to get children added onto an existing 457 sponsorship visa? The father is currently in Australia on a 457 for 4 years and had the children on his initial application. the children are in south Africa and we have submitted all documents on an IMMI account. does anyone have any idea how long it will take for it to be finalised, so they can travel to Australia. please desperately need some help.