Who the hell knows. This shit is uncommon enough as it is in whole dried shroom form, let alone extracts. My guess is inside well-dried mushroom flesh, forever? In an extract... same?
Why do you ask... did you try it and it did nothing? In that case it was probably a half-assed totally guessing extract that didn't actually dissolve and retrieve any of the active constituents, and was not tested by the maker in any way, just "Hey lets soak some of the shrooms in whatever, drain off the liquid and sell it as Fly Agaric Extract." Possibly a totally inactive "tea" rather than an true extract with any assured potency. Alot of people selling "herbal extracts" are just playing around without really knowing what they are doing or testing their results in any way... they are just out to get yur money. What the hell does the "10X" mean anyway? Weight of the shrooms vs. weight of the liquid "extract"? If so that means nothing. Again, just because they soaked some shrooms in something and bottled the result does not mean there is any Iboenic Acid or Muscimol in it whatsoever. Or it could just be an out and out ripoff / scam.
Best suggestion for getting off on these is
1 - Acquire high quality dried shrooms from a high quality vendor
2 - Prepare and use them yourself (i.e., bake on low, then powder and simmer, and strain of the liquid to use, according to proper complete recipes as in that from James Allen which has been link to multiple times here and elsewhere
3 - Use according to JA's usage instructions.
That's what I did and it worked. Cant say about other methodologies.
OR if you are wealthy you could try to find the highly purified & supposedly verified Muscimol that I saw once upon a time for sale... cant find where anymore... which was absurdly expensive.