As an estimation, a backup usually takes a few hours to complete, although the first initial backup may take longer, up to 72 hours. Typically, backups do not take longer than 24 hours.
The time requirement of depends on several factors, such as the
- amount of data,
- number of users in an organization,
- bandwidth and
- speed of the organization's internet.
Backups run approximately every 6 - 8 hours on average. (Note: With G Suite, backups can take longer, as Google imposes daily bandwidth limits.)