We've heard a few reports of this on "Daily limit" blocks, and it appears to be related to a bug in older versions of iOS.
Here's how to fix it:
Lower your time limit by 1 minute - this simple adjustment often makes the "Unblock" button reappear:
Go to "Roots > Blocking (bottom tab)"
Tap the pencil icon on your "Daily Limit" block
Reduce the time limit by 1 minute (for example, if it's set to 60 minutes, change it to 59 minutes)
Tap "Done"
Check if the "Unblock" button now appears
Have an emergency?
If you need to unblock immediately, click here.
If the problem persists:
If the "Unblock" button still hasn't appeared after trying this step, please tap on the chat bubble below and send us:
A screenshot of your "Roots > Blocking" page
A quick note confirming you've tried the step mentioned above