What is QL?
Quantum Leap bonus, it speeds up Launches by 90% and is active for 24hours. If you look at world rankings for launches thats how people can do 100s of launches per week. So if you are in a launch with no QL it's 24hrs, 1 QL is about 2hrs23m, 2QL is about 15m, 3QLs is about 1m30s, 4QLs + then the rocket returns basically instantaneously.