I think this poll might be a little tough because a "portion" of caffeine is a vague. You should have defined portions to be like 100mg of caffiene or something. I have a large coffee in the morning and then a large americano in the afternoon, should this be 2 portions, should the large coffee be broken down into 8 ounce servings, should the americano be broken down into # of shots? Sorry, but I thought I should explain my difficulties with this poll.
100mg would be a pretty big portion. Maybe a grande from Starbucks (with notoriously high caffeine content) is about that. Isn't a normal cup about 40mg?
Well, it varies so much, I just picked 100mg as a nice round number. However, after a little more research I found this website [http://www.energyfiend.com/the-caffeine-database] and did an calculation on the average mg per serving and it came out to 109.97, so I think 100mg was a good estimation.
