Exactly. I rarely understand people who begrudgingly dismiss large, epic games due to their limited time. The size of the game becomes irrelevant if you can save and continue at any point. Feel free to progress as slowly as you prefer. Your quest log sums up what's going on in case you forgot since your last session a few weeks ago.
I bought The Witcher 3 on release and have been playing it since - 2 hours here, a free evening there, maybe on a lazy sunday. I'm still not finished. To me that just means that I'll be able to enjoy the game for a very, very long time.
Information density.
You can have a game that takes a long time, but it would need a LOT of story in it's missions and sidequests to keep it interesting. If you stretch a 10 hour story over 80 hours of gameplay it gets boring real quick because the pacing of the story will simply be too slow.
What about WiiU and the 100s of handheld consoles?
Though, you can actually have wherever you want, if you don't need it connected to a TV, I've seen photos of people playing the Wii U in an airport lounge, all you need is a plug socket.
I have two kids (one is only 2 months old) and also have a long commute, demanding job, etc. I also don't have a lot of time to play games. But the Switch just makes it so easy to play. It's the first console I can play in bed at night without bothering my wife and newborn.
Thus, with its portability, it makes it extremely easy to just play anytime I have time.
Also, why rush? 1 to 2 hours a day is more than enough. This game is a slow burn and I'm loving every moment of it!