If the lesson lasts 1 hour its 216,000 milli seconds
About 15 milliseconds
40 minutes
1000 milliseconds
There are 31536000000 milliseconds.
21,600,000 milliseconds
3,155,760,000,000,000 milliseconds.
35,000,000 milliseconds
900,000 milliseconds.
1,000 milliseconds in one second.
60 seconds is equal to 60,000 milliseconds.
There are 60,000 milliseconds in a minute.
One minute = 60,000 milliseconds.