there is nothing uncomfortable about a 7ft hog loop. The only thing the 7 ft hose does is add is a few additional skills. 1. keeping hog looped correctly, either under cannister light, tucked into belt, or looped under keeper. 2. learning how to donate correctly. 3. keeping the long hose on top of everything and free at all times to facilitate donating. These are all practiced every dive with a modified s-drill. The modified s-drill ensures your hose is free and you maintain practice at doing skill.
on another note tech dives are not necessarily measured in hours. to be a technical dive all a dive has to do is exceed recreational limits (depth, time, overhead environment, multiple gasses).