Hello jjanglipe,
Welcome to Apple Support Communities.
We understand that you’re unable to ignore the time limit for an app on your iPhone with Screen Time enabled. We are happy to help.
Is the parent or guardian able to disable for 15 minutes and ignore the limits for a the day? We are asking as the parent will have to change the limits. Please see the information here: Use Screen Time on your iPhone, iPad, or iPod touch - Apple Support
"Manage Screen Time settings
Go to Settings > Screen Time. Then tap See All Activity, select a category in the list below and set limits.
App Limits: You can set daily limits for app categories with App Limits. For example, you might want to see productivity apps while you're at work, but not social networking or games. App Limits refresh every day at midnight, and you can delete them any time."
Let us know if you have further questions.
Take care.