How often should SaaS founders review competitor changes?

Before launching, most founders study competitors carefully. After launch, product work takes over and that research quickly becomes outdated.

I am exploring a workflow that watches a small, fixed set of competitors and reports meaningful changes in pricing, features, positioning, and integrations every couple of days—without creating constant notification noise.

How often do you review competitors after launch? Which change would be important enough to influence your roadmap, and which changes would you ignore?