The size of the bubble is limited by the small amount of soap solution clinging to the ring. When you blow bubbles with the absorbent paper cone, you first submerge it into the bubble solution which absorbs a large quantity of the soap mixture. This solution becomes a reservoir for blowing really large bubbles. When you start blowing the bubble, the solution is pulled out of the cone as needed by the growing bubble. The size of it is limited only by your skill, lung capacity and the quantity and quality of solution that is available in the cone.
Evaporation is also a factor that shortens the life of the bubble.
The bubble wall becomes thinner because of evaporation and eventually the bubble pops. S.A. San Jose, Costa Rica. All rights reserved.