Just throwing these numbers out for people, To completely upgrade everything and get every set it costs 2874 plat coins and 886 arc wood (depending if you upgrade normal wings). That's not including a base so 8 more to each. If you run with a demonic nation at 100% efficiency, just enough miners and the rest demon spirits (230+) you make an arc lumber ever 34.6 seconds and a platinum coin every 36.9 seconds so to save for everything it would take roughly 30 hours just to farm the coins not including setup which is another few hours.
Edit: my numbers are slightly off for coins, apparently it was raining or snowing so its actually a little bit faster than 37 seconds.