cut as large or small as you want but quarter size and larger tend to recover more easily IME. it takes a few weeks for them to heal and attach and can take several months to grow to a more pronounced toadstool shape.....................unless you frag the cap off, then the cap will reattach in a few weeks and the stalk will take a few weeks to heal and start forming a new cap, within a few months you've got two the same size only shorter.
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