zmprov gacf | grep zimbraMailPurgeSleepInterval
zmprov gs server.domain.com | grep zimbraMailPurgeSleepInterval
zmprov mcf zimbraMailPurgeSleepInterval 1m
zmprov ms server.domain.com zimbraMailPurgeSleepInterval 1m
(1m purges ~1440 accounts per day. Setting a server value overrides global.)
Mailbox Purge - Zimbra :: Wiki