Multi-region on each, implementation complexity?

Implementation complexity follows the data and operating boundaries you need. Specify regions, legal entities, catalogs, prices, inventory, customer identities and staff permissions, then decide what is shared. Test representative local payment, fulfillment and return flows on the actual Salesforce product and Adobe deployment. Include synchronization, translation and merchandising ownership in the design. Counting sites or currencies alone does not determine the work, and a general Commerce Cloud label is too broad for an estimate.

Official references: Salesforce product architectures; Adobe deployment differences; Adobe PaaS scope hierarchy.