I'm a little bit puzzled by 5jj's response in this thread. Because I know that I shouldn't ask unrelated questions in the same thread, I decided to open a new one. I'm assuming that 5jj's sentence is correct.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
Ten minutes is not a long time.
Once again, I am thinking of 'ten minutes' as a period of time.
I am arrogant enough to believe that I don't make many mistakes, apart from the typso that plauge my psots.I'm assuming that 5jj's sentence is correct.
However, please don't assume that those of us who respond regularly are incapable of mistakes. We are simply giving our opinions. The fact that many of us have been teaching and/or writing for many years does not mean that we are perfect. I have used the several times since I joined the forum in posts in which I have apologised for an infelicity or solecism.
1) But would you have missed that 40 pounds? (Here I'm regarding "40 pounds" as "money".)
2) But would you have missed that 20 litres of water? (Here I'm regarding "20 litres of water" as "amount of water".)