Welcome to the Forum @anon29627454 and thank you for reaching out!
I can confirm that there is no limit on the number of tasks you can create per project. Having said that, if your project contains a very high number of tasks there is a chance you might experience some slight performance issues.
Additionally, there is a thread in the Forum regarding CRM: Asana & CRM. You might find some useful ideas and if you are interested, you could share your experience with other members.
Please let me know if there is anything else I can help you with!