How long does it take for the grail quest chain to actually start/trigger?

[Fifty Shades of Kek]

I'm well past 100+ turns into this planet and have long since practically won about 30-35 turns ago by literally all the regular victory condition metrics. But still no sign of the scanner dialogue/build quest thing popping up for me to start constructing it.

And yes, this planet has Noble Quest objective/Grail Detected trait.

 

[Sandman25DCSSS]

I had it triggered around turn 30. Something is wrong with your game IMHO.