After a hundred hours you know you are still learning.
After two hundred hours you just start feeling comfortable.
At four hundred hours you think you know it all.
At 600 hours you know you know it all.
At 1,000 hours you realise you still don’t know everything, but the bits you don’t know are coming more slowly.
At 5,000 hours you are grateful that none of those bits you didn’t know has caught you out.
At 10,000 hours you just hope there are no more bits!
If you review the statistics I seem to remember the serious gotchas seem to come between 200 hours and 600 hours - makes sense.
You should be safe now IO540!!!
and there we all go but for the grace of God, 200 hours or 10,000 hours.