Semicolon/Comma trouble

Poncho89I've used commas in all example for sake of ease.

I'm glad you're having an easy time so far. Now, how about going back, thinking about it, and trying to punctuate correctly?

Semicolons separate independent clauses.
Colons separate independent clauses from result, clarification or example clauses or phrases.

The way I would do them...

"I'm not even kidding; that's exactly how it happened"
"I didn't even cut it down, lasted about ten seconds."
"You're wrong, totally and completely wrong."

The independent clause may be the bit I'm having difficulty with. Is "lasted about ten seconds" an independent clause? Likewise with "totally and completely wrong"?

Thanks

Pretty good. #1 and #3 are fine, but the second one is a comma-splice error, and the clause also lacks a subject:

I'm not even kidding; that's exactly how it happened!
I didn't even cut it down; it lasted about ten seconds.
You're wrong, totally and completely wrong.

Is "lasted about ten seconds" an independent clause?- Yes, as am

Thanks for your help. I'll read up more tonight and practice examples.

One last thing if it's ok? The second example is a

Poncho89The second example is a line from a character who will often speak 'incorrectly'

I don't think so really, if that is a line of dialogue, then such is common. Of course, we do not speak with punctuation marks, but for the sake of transcription, I would do this:

I didn't even cut it down. Lasted about ten seconds.

Struct

Thank you very much for your help.