What is the duration of an Odoo 20 migration or upgrade?

There is no set timeline for upgrading from Odoo 20. A small database with minor customizations can be upgraded within a few weeks. Several custom modules, third-party integrations, a database, and complicated workflows will require a full scale assessment and migration schedule that could span a couple of months. The project plan will have to include time for adapting the custom code, carrying out test upgrades, conducting functional testing, performing user acceptance testing, and carrying out the final migration to production. The wider the version gap and the greater the level of customization, the more work one can expect as part of the Odoo 20 migration or upgrade.

Learn about Is it possible for me to go directly from Odoo 16, 17 or 18 to Odoo 20?