Sigh. Strange that a million of something is e7, but a millionth of something is e-8. European number system fail.
You were off by one the other way, one microsecond is e-6. And a million of something is e6, not e7, just as a millionth of something is e-6.
"There is nothing new under the sun, but there are lots of old things we don't know yet." -Ambrose Bierce