To be fair, I understand why they're skeptical. A brain's perception of itself is imperfect, and sometimes completely made-up. (Actually, one could make the argument that all perception is completely made-up, but I digress.)

Since we're talking about things that happened inside my own head, how can I know whether I actually experienced a certain period of time, or only created a memory of having experienced that time? My own recollection of it may be flawed, so it logically follows that in order to know for sure, I have to find some way to objectively quantify it. I don't know how I'd objectively quantify the number of thoughts I'm having, though, lol.