I read the patch notes when PoE came out for PS4, and it said that day in Cetus lasts 100 minutes and night lasts 50.
It may not be 100% percent accurate please tell me if you get a false time (Only tested on EU). Invasions. You can find the clock here. On the Warframe Market you can sell and buy: Parts, Mods, Blueprints, Relics, Riven mods and other stuff | Now we have riven auctions ! Keep up with alerts, invasions, sorties and ongoing activities on PC, PlayStation 4, Xbox One and Switch.