My DH lives away for work. Might come home once a fn or once a month. We are still together according to centrelink (well we are still together, lol). He's never home more often than that & its only for 2 or 3 nights at a time.
We were actually entered as defacto back when we were just 16 & 18. Not sure 100% if it was right, but we'd been seeing each other 6 months & I had to go in to get youth allowance after loosing my job. He came with me & she asked if we were defacto. I told her I had no idea & she said are you sleeping together. I said yes & thats how early it happened for us. We weren't living together, so as I said I don't think it was right, but its a bit late now. It did actually help when I wanted to move out of home coz it proved how long we'd been together (being only 17 I was allowed to move out if we'd been in a relationship for more that 12 months).

Its all pretty confusing