I've come to realize that workout duration isn't important at all and can be anything we choose. It's the other 23ish hours of the day that matter. Are we active, engaged, connected, rested, peaceful, joyful? Or is the workout "ideal" and everything else a train wreck? There have been plenty of times when my workout schedule was optimized to the max and my mood was terrible and my relationships strained. I was socially isolated and anxious, injuries piling up, exhaustion, insomnia, restriction and rebound eating battling it out. That was really not healthy or fun and didn't produce a great result. Now, jumping rope for 5 minutes and standing on my head may sound like a dumb and pointless workout, but those other 23+ hours are where the magic happens. I have so much more energy for life now compared to when I was only exercising for fat loss or to look a certain way. My "workout" was 5 minutes long, but I walked miles with the dog, mowed the yard, moved heavy furniture by myself, carried nine bags of groceries at once, went swimming, and did somersaults down a hill with the neighbor kids. When I was killing it for an hour in the gym, I'd spend the rest of the day lying motionless. So now, with my short, lame workouts, plenty of food and great sleep, my energy output and general fitness is a lot higher than when I was training hard and restricting my food. It's crazy to think about.
I'm pretty confident that someone could do a little bit each day and get into great shape mentally and physically because of how it carries over into your thoughts and actions all day long.