Is there any seperation period which is must before divorce in Australia?

is there any minimum period which we have to show as seperation period as per legal rules before filing for divorce. if yes, do we need to file for legal seperation or can we show it just by telling that we have been seperate since ....so much period? i mean should this seperation period be started after some paper work or can we just tell it at time of divorce?|||one year divorce in Aust