Even that isn't really full proof since bug fixing and playtesting are by far the most tedious and unpredictable parts of making a game. And what you may have thought were just a few bugs, could quickly turn into a seemingly endless rabbit hole.
So, one day you could tell your fans that you were almost done and that you only had a few more bugs to fix.
And then the next day you'd be forced to let them know that you may need many more days. Which some may not take very well, and you can bet they'll be vocal about it.
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