There are no limits on the usage of Spotalpha tools (e.g. Portfolio Optimiser, Alpha Builder, etc.). The user should feel free to use them as much as their liking during the active subscription period.
Once the subscription expires, the product will automatically cease to function, and the user will no longer have access to its features and services.
Useful Links:
Spotalpha US Pricing
How to Use Spotalpha (YouTube)