There are some write ups out there:
https://wexnermedical.osu.edu/blog/covid-19-vaccine-long-ter...
> Once the body creates that spike protein using the mRNA instructions, the body quickly breaks down those mRNA strands and they dissipate within a few hours or days after injection. The mRNA never enters the nucleus of any cell (where the DNA is located), it doesn’t affect any genetic material in the body, and the mRNA strands are removed from the body through everyday cellular processes.
https://www.nebraskamed.com/COVID/where-mrna-vaccines-and-sp...
> The Pfizer and Moderna vaccines work by introducing mRNA (messenger RNA) into your muscle cells. The cells make copies of the spike protein and the mRNA is quickly degraded (within a few days). The cell breaks the mRNA up into small harmless pieces. mRNA is very fragile; that's one reason why mRNA vaccines must be so carefully preserved at very low temperatures.
You can follow the links for fuller explanations.
If you want to see hard data, I'm also aware of two studies that investigate how long the spike-protein lingers after vaccination:
This one says five days: https://academic.oup.com/cid/article/74/4/715/6279075
And this one says ten: https://www.mdpi.com/1424-8220/21/17/5857/htm
Doesn't really inspire confidence in these results, right? I mean, first you cited a claim that said "few hours", and then the expirimental evidence shows at least 5 days, and another one says 10, and may be the next study that looks closer will find that it ll last at least 30 days...
But hey that is ok, because that is how "science" "progresses" duh, right?
EDIT: Oh, and it seems that CDC removed the claim that "The mRNA and the spike protein do not last long in the body" from its pages..
https://web.archive.org/web/20220721092000/https://www.cdc.g...
The numbers 5 and 10 are means. "A few hours or days" represents a range. If you look at the first study, there were several participants who never had detectable spike protein, even when they first checked on day 1 after vaccination. So the spike protein cleared in less than a day for a large chunk of people (i.e. "hours").
As for which study I would trust more, the first study (that reported the shorter period had four times the number of patients). But I guess that is also not convenient for your narrative.
So what? You did say "few hours", right? I am only pointing out the ambiguity in your claims.
>there were several participants who never had detectable spike protein, even when they first checked on day 1 after vaccination.
Look that is fine. But saying "hours or days" is as good as saying we don't have a clue how long the thing lasts in the body. Because, we know that the spike protien itself has toxic effects.
Also I see that you ignored the bit about CDC modifying the statement about this. Not convenient for your narrative?