Option A — Apple Screen Time
No download, no subscription. Apple's own App Limits can block NCAA March Madness Live specifically, and Downtime can switch it off by time of day.
- Turn Screen Time on. Open Settings → Screen Time. First time? Tap Turn On Screen Time, choose "This is My iPhone", and set a Screen Time passcode — pick four digits you won't type on reflex at 11pm.
- Add an App Limit. Still in Screen Time, tap App Limits → Add Limit.
- Select NCAA March Madness Live. Apple sorts your apps into broad buckets and NCAA March Madness Live sits with the Entertainment apps. Tap the arrow beside Entertainment to expand it and tick NCAA March Madness Live only — or just type "NCAA March Madness Live" into the search field at the top, which is faster. Tap Next.
- Set the allowance. Choose how long NCAA March Madness Live gets each day. 30 minutes is a soft cap; 1 minute is effectively off. Tap Customize Days if weekends should be different, then tap Add.
- Turn on Block at End of Limit. Reopen the limit you just made and switch on Block at End of Limit. Without it, the "Ignore Limit" button hands the whole evening straight back to NCAA March Madness Live.
- Add Downtime for a time-of-day block. A daily budget isn't the same as "off after 10pm". For that, go back to Screen Time → Downtime → Scheduled and set the window (10pm–7am is the classic), then check that NCAA March Madness Live is not listed under Always Allowed. During Downtime it's blocked outright — there's no allowance left to burn.
The honest catch: it works, but it's four screens deep in Settings, the limit resets its own way, and if you know the passcode you can undo it in about six seconds. That's why so many people set an App Limit once and never think about it again.