Belated update. Turns out we've got a male and female, and they've paired up! Caught them with tubes descended digging up our gravel about a month ago. Gave them a piece of slate which they've been keeping immaculate. Haven't seen eggs yet but they're going through the motions.
About 8-9 months. Like I said I haven't seen any actual eggs, just kinda the warm up motions. I don't honestly expect eggs for at least another 4 months