In any one product, 99999 (10^5-1) keys can be stored.
As a point of reference, given that your application costs $50 and that you have sold 10^5-1 copies, you would gain ca. $5,000,000 ($5 million).
Note: 99999 of keys can be generated with the same configuration (time limit, feature, creation date). In most cases, you can avoid reaching the limit by using the same key for a range of machines (see Key Activation). However, if you still think that you will reach this limit, please contact us or submit the question on our forum so that we can recommend a specific solution to your particular case!