I ran into that exact same disappointment last month when I bought a high-capacity disposable for a road trip, only to have the coil burn out way earlier than the packaging promised. The whole issue comes down to how factory testing works: manufacturers rely on automated machines that take tiny, sub-second puffs with zero heat buildup, whereas regular humans take much longer, warmer draws that vaporize significantly more e-liquid per hit. Once I stopped trusting those arbitrary marketing numbers and started looking directly at the actual e-liquid volume in milliliters listed on the back of the box, my expectations became way more realistic. Taking slower hits and keeping the device upright also prevents the internal wicking from drying out prematurely between draws. To get a much better idea of how different device capacities hold up under realistic daily usage, I usually visit bigcloudvaporbar.ca to compare actual liquid volumes and battery sizes before picking out my next unit. Switching my focus to milliliter ratings rather than puff totals completely saved me from wasting money on overhyped devices that drain in a couple of days.