The individual update time, if we're going 1 update per event, doesn't matter that much. A lot of people won't have anything to play in these single event updates. So there is no point in downloading them.
What matters is if these single event updates, over the course of the entire day, speed up development time or not compared to the last few days.
A very informative review I ran across makes me think this is unlikely. Let's look at the numbers...
Day 19 contained roughly 2340 renders.
Day 18 contained roughly 1900 renders.
Day 17 contained roughly 1500 renders.
Day 16 contained roughly 1000 renders.
Notice a pattern? Each consecutive day adds several hundred renders.
Now, to be fair, let's look at the number of events. As the raw number of renders can be misleading.
Day 16 contained 9 events
Day 17 contained 13 events
Day 18 contained 12 events
Day 19 contained 13 events
So, the number of events are fairly even. So, what explains the ever increasing number of renders? Could if simply be bigger or more important events? I suppose it could, but that doesn't help the situation as I think you can assume, due to the progression of the game, future events will be bigger in general than the previous events.
So in the end, I think we're still going to be at around 1 year per day. And that this upcoming day, continuing the trend, will have roughly 2500 renders.
The slow development times are unfixable unless he either 1) Reduces the number of renders, instead of increasing them. 2) Manages to find someone else to help with renders or 3) Makes everything else as efficient as he can (translation/writing).
I don't think any of those are likely, but #3 is the best chance. Like my last post talked about.