I'm not too impressed when there's only ash left because I know I also smoked a dottle. Fortunately the taste tells almost every smoke when it's past the limit of tasty and that's when I dump what's left.
ah yes, the boiling - that was there the other night - I continued onwardPacking loosely, tamping gently and drying the tobacco helps reducing the so called dottle. That said, I usually dump what remains in a bowl at the point when I hear boiling sounds of the condensate at the end of a smoke. I'm not into rare blends so I have nothing to regret when a smoke comes to its end...
I don't really think about it. If light goes out, I'll look into chamber to see if I should smoke further. If it's near the bottom, I'll stop. Sometimes, things just go right and the bowl will end at the bottom of the chamber.EDIT: Fixed Capitalization in Title (See Rule 9)
I find that when it comes to rarer harder to come by blends I tend to smoke down to the bottom of the bowl - which is typically less enjoyable - it's almost the antithesis of the initial intention - ever happen to anyone? how far down the bowl is too far and deemed 'dump'?