@MsMaudlin
So after deciding to experiment with bicarbonate of soda and green King sized Rizla papers, for experimental and information purposes only, here are my results and pictures below, I have already swallowed 10 grams of bicarbonate of soda in 3 green King sized Rizla papers, now I will show you how long it will take to dissolve in water.
The picture shows you how many Rizla papers you need to use, two, three or four and how they are stuck together, plus they are next to a UK two pence piece coin and a AA Duracell battery.
05 grams = Two Rizla
10 grams = Three Rizla
25 grams = Four Rizla
After submerging the 10 gram bomb into water it took precisely 35 seconds to open up and release the powder. If I decided to take 30 grams I would definitely aim at swallowing three 10 gram bombs in under 1 minute as they are easy to swallow, if you are a smallish build I would suggest going for the 05 gram bombs.
Cheers Geo