[Dovecot] Maildir Control files and quota

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Hello all, the dovecot wiki recommended that the index and control files
for maildir be placed on a partition which does not have a quota.

I have a VPS which gives me 20 gigs of space. Since space is tight, is
there some way to calculate how much space the partition needs for the
control and index files? Would 1 gig be sufficient in the long run?