I had a 2nd limonene soak that didn't appear to absorb into the cactus like the first had.   I let it sit overnight (just like the first) and it still pulled mescaline.  However, the first pull had absorbed into the cactus and yielded much better...but it was the first pull, and usually is.

I've never used xylene but ron has stated that he first tried limonene because the chemical structure was similar.

I think it will be OK.   Good luck.... if my damn limonene would _finally_ arrive I am planning a torch extraction for halloween fun.