Give my story a one-star rating, and the answer will magically pop into your head.
Ok I have seen you a few times on forum. I have to ask. Why do you want your story to be nuked? Is this some bet or a weird masochistic fetish?
(no kink shaming)
now that is super scientific! :)
The problem lies in that, if you post each time a different chapter with different story, you get 24*31=744 samples but for each you have data from only one point in time. And the same chapter could perform differently if posted at different time.
Easiest solution would be to post the same chapter every hour of the month.
This on the other hand will get you data from only one sample but for 24*31=744 points in time of time. And one sample is hardly scientific. All you get from that is only when was the best time to post that particular chapter.
To be able to deduct "best time to post something" as per your question, you would have to have data from multiple samples.
As per quick search according to different sources the minimal sample size varies. Some suggests that 30 is enough. Other that 100 is a minimal value. Wikipedia has a table where values vary from 6 to 920 depending on type of research and desired accuracy of results.
So to be safe you could combine the two mentioned approaches and write 744 chapters of different contents and length and dump all of them every hour.
That will give you 744 samples and 744 data points for each sample.
But that gives you data only from one month. And the same chapters could perform differently in different seasons and around different holidays or events.
It is common knowledge that weather and amount of sunlight has an impact on persons mood. People might search for different types of stories while depressed by winters lack of warmth and sunlight, than when they are full of dopamine while sunbathing on a summer beach.
During school year and vacations people have different amount of free time and school/work related stress.
Important holidays like Christmas or Valentines day may have huge impact on which story will succeed.
And so on...
I was wondering, how do you know when is the best time to post a new chapter? Are readers of certain genres more active at certain times?
TLDR: to have most accurate and scientific answer to "How do you figure out the best time to post something?" I recommend to write 744 chapters across whole spectrum of genres and tags with various lengths, than post them all every hour of the year.
Hope that answer your question.
PS:
Oh and please remember that o make it scientific you need a control group of equal size as your testing group.