Slowing down / losing speed and altitude takes most of the time, actually. They could probably do it faster but at the cost of way more fuel (just guessing).I don't have internet data to burn on YouTube so apologies if this is covered, just wondering what takes up the other 18+ hrs of capsule free orbiting before reentry? One would assume they could leave detaching until the station passed say 2hrs away from reentry point leaving plenty of time for final system checks before retro burn. Obviously something takes a lot more time!