How many portal users does sugar support?

Hey,

Portal users are Contacts in SugarCRM, therefore you may create as many portal users as many Contacts you have  in your Sugar database.
AFAIK, the number of portal users (again, they  are Contacts in Sugar) that may log in to the Portal concurrently , is defined by the number of Concurrent Portal Users license you've bought - please check with your Partner or Customer Success Manager 

Thank you Dmytro!

Stock standard I believe its 100 but if you need more I am sure SugarCRM will have an option.

100 concurrent logins, while the number of portal users could be created is not limited and could be equal to number of contacts in CRM, AFAIK