This came up on Reddit and the founder responded directly there, seemed like they were going to add a tool tip or something to make it clearer.
On https://clerk.com/pricing , “Customizable session duration” is listed as a primary benefit of the pro plan, and in the chart we show that the free plan is “Fixed to 7 days”
Apologies we failed to make it clear before you started, that’s definitely not intended. We thought this was a good limitation for the free plan because it doesn’t impact your ability to learn if your product is resonating. If it is, and our default doesn’t work for your app, then we hope you can upgrade now that your product is validated. (It’s maybe worth mentioning that the default of 7 days was selected by copying Google’s session lifetime, also not meant to be nefarious.)