A Platform App Builder has deployed a change set from a sandbox to production.

A custom field type change can substantially increase change-set deployment time because Salesforce may need to transform existing stored data to conform to the new field representation. Salesforce ' s official Change Sets Best Practices documentation specifically warns administrators to consider possible deployment delays when a change set includes custom field type changes. The documentation explains that these changes can require modifications across a large number of existing records and therefore can extend deployment for a significant period. Salesforce even recommends considering a manual field-type modification after deployment when avoiding the delay is important. Profiles may increase deployment complexity because they contain access metadata, but they are not the specific documented cause identified here. Dependent fields and roles likewise do not inherently produce the extended data-conversion processing associated with changing a field ' s underlying data type.

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