If you want to convert all elements of a to a single numeric vector and length(a) is greater than 1 (OK, even if it is of length 1), you could unlist the object first and then convert.
as.numeric(unlist(a)) # [1] 10 38 66 101 129 185 283 374
Bear in mind that there aren’t any quality controls here. Also, X$Days a mighty odd name.
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