The migration speed varies for each organization and user depending on several factors such as the bandwidth of the server, the size of data to be migrated, source connections accepted by the server and the latency between the Zoho servers and the source server.
In general, to complete a migration for a batch of 25
users, each with a mailbox size of around 2 GB, and the maximum Connection Limit set
to 10, it approximately takes 11 hours.