What's your longest session, first shell to last shell? I'd be interested too in ideas of topping up. How long can you keep a session going and does it affect your stomach after time? Presumably after too long you'd dehydrate too much and not be able to catch up. I normally just mix up 3 to 4 shells and drink those over a few hours but sometimes, especially if I am underwhelmed by the first 4 shells I'll add on some micro. So I've been drinking for about 6 hours now but I do spread my shells out up to an hour and then had a bit of a gap before starting the micro.