Best time to post on X
Three slots worth testing, what X's ranking actually rewards, and why a table of hours is a hypothesis rather than an answer.
Three slots to start with
These are in your audience's local time, which is the part most advice leaves out. If your audience is elsewhere, the calculator converts them into your own hours so you schedule the right instant.
What X actually rewards
X has the shortest half-life of any network here — most of a post's reach happens inside the first hour, and almost all of it inside three. That makes timing matter more on X than anywhere else on this list. The ranking rewards replies heavily, so a post that starts a conversation outperforms one that gets likes.
Format matters more than the hour
Text with a strong first line. Links suppress reach on X more than on any other network — if the link is the point, put it in a reply. Threads work when each post stands alone; they fail when post three only makes sense after post two.
Worth knowing before you automate X: Posting through X's API requires a paid tier, currently starting around $100–200 a month. This is a budget line rather than a review queue, and it catches anyone who assumed a free tier would cover a scheduler.
How to test this properly
Because the half-life is short, A/B testing is fast here — you get a readable result in two weeks rather than two months. Vary the hour, hold the format constant.
The method that works on every network: change one variable, hold everything else, and give it long enough that you are measuring the change rather than the noise. Two weeks on X is usually enough.
Questions
Does posting time matter on X?
More than anywhere else on this list. Reach is front-loaded into the first hour, so a post into a quiet hour is largely a post nobody sees. There is no recovery later.
Do links really reduce reach?
Consistently, in most people's measurements. The usual workaround is to post the substance and put the link in the first reply, which costs you nothing if the post stands alone.
How often can I post?
Several times a day is normal on X in a way it is not elsewhere. The short half-life means posts do not compete with each other much.
Are threads worth it?
When each post earns its own place. A thread that is one idea stretched across five posts reads as padding, and the drop-off after post two is brutal.