I explained to you why they are not. Yes, they do - when they aren't doing science. Looks like you missed the point again. Well, you've been told. Whether that leads to knowledge or not remains to be seen. I have no problem with your using the term "length of time" to mean "time period" or "duration" or similar. As long as you're aware that a time interval is not the same as a length interval, confusion is unlikely. There's no problem with imagination, as long as you don't confuse your imaginings with facts. Are you thinking about anybody specific? I have emphasised the important bit for you. Hope this helps! Or perhaps (better): "for more than a a very small duration". No, that's not wrong. The context is informal there. See? And again.