It's less than one order of magnitude. 4 million vs. 24 million is a factor of 6, not 10.

orders of magnitude don't have to be base 10

It's 2.5 more base 2 orders of magnitude

4 vs 24 million is "about an order of magnitude", if you ask physics. We don't need to be accurate with that expression. And Log_10 (24/4) ≃ 0.78, it's not far away from 1.

Umm, I'm pointing out that 7e can't correctly say 'more than one order magnitude, less than two. So, plural!' Note the "more" and "plural".

Even physicists say that one is not plural.

I guess in that case you could still say its 0.6 orderS of magnitude... So not entirely false.

It still wouldn't be 'more than one order magnitude'.