holders of a 457 visa may be employed for a period of up to four years and may bring any eligible family members, including same-sex partners, who have unrestricted work and study rights in australia. "if your sponsor is a start-up business or has traded in australia for less than 12 months, then the visa will be granted for 18 months." holders of the subclass 457 visa have no limit on the number of times they travel in and out of australia.