I currently go through reactions to things I'm trying - binders, antifungals etc. When I have a bad reaction I can be using it 6 or 7 times a day. Usually only 1 drop does the job. Sometimes I feel so bad I'll take 2 drops at once. I can't be sure there's any greater effect. Although I think I notice it kicking in faster when I've eaten recently. I suspect it's absorbed in the stomach and that higher acidity breaks the capsule down and absorbs it faster.
So in that 2-3 weeks I would have been using it 6 or 7 times on some days and maybe once or twice on others. I usually have one in the morning just in case I start to feel bad, and if I don't feel it wearing off (as in I'm not all that sick that day) I'll not take any more.
I would say it's definitely worth it over the powder. Just my opinion. It's a lot easier to put a drop into a capsule than make a few capsules each time of the powder. Plus, I've hardly made a dent in the bigger bottle I have now, so it's at least as cost effective as the powder, possibly more.