Problem with deadlines is, when you set up one, you HAVE to stick to it, or else you will be exposed to critics and stress and whatnot, and for a single artist, it could mean a mental breakdown, easily.
A more realistic choice is for the author to say something about releases when it's 95% done, so what it means is that whats left is very minimal and a can be completed quickly, and never set for a specific date, so instead of saying:
I will be releasing the next pack on the day X of the month Y
Better say
Next release will be in the month X, if there's no further unexpected stuff coming up
Which will give the author at least 28 days of timeframe for the release, this is more flexible and can accomodate for unexpected issues that might arise