Winged Ones took a year to complete with Novelty and another year with RenPy since I've just learned coding with RenPy >< but now that I'm familiar with the coding and minigames, I think it will be around 3-4 months maybe? With drawing CGs, it still should be less than a year.
Oh, but do take note that Bermuda is about 3 times longer in terms of word count >< I think I posted somewhere about the demo wordcount comparison between Winged Ones and Bermuda -- and that's only counting the general route, not including bonus antagonist route ><
What I can say is... your patience will definitely pay off! ^^-