The time it takes to setup an integration with Shopify will depend on the platform to which we have to integrate as each platform has their own pre-requisites before the integration can be made functional.
As example, to integrate with DSCO Platform, the account's bearer token is required. This bearer token is provided by DSCO Support team and can take upto 24-48 hours after the request is made.
On the other hand, to integrate with CommerceHub OrderStream, an "integrated account" is required. Hence, brands have to request CommerceHub an account upgrade from their "web-based account" to have the "integrated account".
Also, for some integrations, we may need to do some test activities - e.g. with DSCO, we have to do Gandalf Testing and Onboarding process if it's a new account, with CommerceHub, we need to do the EDI testing on OrderStream Testing platform, etc.
Assuming above pre-requisites are met, Dscopify setup and integration with Shopify can take 30 minutes to few hours to get all systems integrated.