5 Billion is 40 seconds of government spending.
Someone check my work.
2018 spending = 4 trillion.
How about this?
60 sec/min
60 min/hr
24 hr/day
365 day/yr
So 60 * 60 * 24 * 365 = 31,536,000 sec/yr
4,000,000,000,000 / 31,536,000 = $126,839.17 / sec
5,000,000,000 / 126,839.17 = 39,420 sec
39,420 / 3,600 = 10.95 hours