1 billion is 1,000 million
1 trillion is 1,000,000 million
1 trillion is 1,000 billion

1 billion seconds equates to approximately 31.69 years

1 trillion seconds equates to approximately 31,688 years 

3 billion seconds equals approximately 95.14 years 

 So what you are saying is the US government have a debt of 36 trillion dollars is a lot?