Most indy devs are either solo or a small team, updates every month aren't that slow unless this is the only thing you play.
And you calculate how long the game hasn't been updated. And then you can write.
ver1.5-1.6 took 104 days, Nuteku is most likely a solo dev. For the game AI Revolution, the team is less than 10 people, updating the game every 2 months. The Dev is doing fine with their pacing.
