Less than 1 second.
2 billion seconds
If you count one number a second, then it will take 25 minutes.
it take 1000000000000000000000000000000000000000000000 seconds to count to 100 ; D
That depends on how fast you can count.
4.56 seconds
4543 days
impossible
It would take nothing
As a human, it will take more than a lifetime.
599,999 days.
Less than a second.
100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 billion hours