How many External ID fields can you have per object? External ID: When importing custom objects, solutions, or person accounts, you can use external IDs to prevent duplicate records from being created as a result of the import operation.
Maximum number of 'External Ids' per object or entity. You can designate up to 25 External ID fields per object. External ID fields must be Custom text, number or email fields. External ID fields contain record IDs from systems outside Salesforce.
Yeap, I think it should be 25, refer this
https://help.salesforce.com/articleView?id=000324871&language=en_US&type=1&mode=1
upvoted 3 times
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radhika
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