Break that habit dude, it's there to be ridden and I'd wager it is a much nicer ride than a lower-end Giant.
Yeah, that is a lot of riders in one place. We have an annual 60km ride up one of our freeways which attracts ~10,000 people. The major problem is there is a wide variation in skillsets and experience. If your a group looking to go fast in a ride like that, it can be a recipe for disaster. Last time they ran the event in 2013, the 60km start was delayed, but they did not delay any of the other starts. 20km, 10km, 4km starts staggered along the same route so they all would finish within a reasonable time of each other. By the time the 4km start was away (Mums, Dads, young kids, training wheels, etc), the fast riders from the delayed 60km were still coming up behind them, instead of already passed. Very lucky there were no serious incidents.
An 80km ride will take anywhere from 2-4 hours depending on skill, fitness, elevation profile and of course, how hard you are pushing. A typical flatish 70km ride with around 500m climbing I'll average between 25-30km/h, which takes around 2.5 hours. Same distance in the hills with 1000+m climbing will be more like 3.5 hours.