How long does a Meta creative test take before the read means anything?

Why does a two-week read usually mislead?

Because two weeks isn't enough delivery for the swings in any single week to average out. Look at four consecutive weeks from a genuinely strong account: 32.7x, then 49.2x, then 55.3x, then 21.9x. Read the first three and the test is clearly working. Read the last two and it has collapsed. Both readings come from the same account, the same funnel, the same creative, and only the stopping point changed.

That's what a two-week read looks like from inside an account that ended up fine. The volatility isn't a sign anything's wrong. It's what real weekly numbers do before enough of them have accumulated to show the underlying shape instead of the noise around it.

When does the clock actually start?

At account access, not at the day the contract gets signed. That distinction is worth stating plainly because it's the thing that actually delays most engagements in practice: paperwork, internal approvals, and getting someone into the ad account can eat a week or two before a single ad goes live. First ads are live in week two of actual access. Counting from signing instead of access makes the timeline look slower than it is, and counting from access is the honest way to set expectations from day one.

What if the first two weeks already look bad?

Then you still don't have a read, for the same reason a good-looking first two weeks isn't a read either. A slow start on a new creative can mean the angle is wrong, or it can mean the account is still in its early delivery days and hasn't found its footing with the audience yet. Two weeks of data can't distinguish between those on its own. The honest move is to keep watching through week four to six rather than pulling the ad on day twelve because the trend looked wrong on day ten.

This is also where a pre-launch kill filter earns its keep without shortening the clock itself. The Gauntlet removes scripts that were never going to work before they spend anything, so what actually reaches week two is creative that already survived a real read. That doesn't make the four-to-six-week window arrive faster. It makes what's inside that window worth waiting on.