That's what I like about eTools and the WW App on my iPhone, it calculates for me
But before, when I was doing WW on my own, I would actually go through and recalculate the points based on the meal. If I was having a double serving or whatever of something at a single meal, I'd actually go in and recalculate because sometimes it came out, say, 4 pts or sometimes it came out 5 pts depending on the food. If I was eating a single serving at two different meals I'd just count each serving as a single serving. I guess it comes out to about 4 or 5 hours, but that was never the rule.
I'm re-reading this and it doesn't make any sense, but I swear in my head it does!