It probably depends on how mass and time duration of the fluctuation are traded between themselves. For quantum fluctuations which return back to nothingness this relation is define by the principle of uncertainty, and for any fluctuations with significant mass, its time of existence would be minuscule share of a second, which would be enough only for one static observer-moment.
But if we able imagine very efficient in calculations computer, which could perform many calculations by the time allowed for its existence by uncertainty principle, it should dominate by number of observer-moments.
It probably depends on how mass and time duration of the fluctuation are traded between themselves. For quantum fluctuations which return back to nothingness this relation is define by the principle of uncertainty, and for any fluctuations with significant mass, its time of existence would be minuscule share of a second, which would be enough only for one static observer-moment.
But if we able imagine very efficient in calculations computer, which could perform many calculations by the time allowed for its existence by uncertainty principle, it should dominate by number of observer-moments.