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Magento upgrade estimate - sanity check

Magento upgrade estimate - sanity check



I've been quoted two vastly different estimates (in days) for an upgrade from Magento 2.2.8 to Magento 2.3.x (latest).


There are some custom modules and integrations to CRM.


Now, I realise without seeing the site and config, etc. there are a lot of unknowns but please can you let me know what I should be expecting here (a range would be great)?

If there is any more information I can give to get more accurate estimates,

please let me know. Note, I can't give site identification details, etc.