What is the break point of debt in a country and or person?

Any and all countries, and personal debt?
Where interest arrives at 100% GDP or personal debt from credit cards/mortgage/student loans? That takes 100% of your income? To service one’s debt?

Also how high is must be your personal debt be for $1,000 per month interest on a 20% on a credit card?

For example a $4,500 interest on debt is $80 a month.
How much debt is there to go up to $1,000?