This is an interesting character building episode for Seven of Nine. Similar to the movie "Passengers", she is the online wake person on a ship (well the doctor is also around). To pass a radioactive nebula that burns the skin of anyone on board but Seven, the doctor puts the whole crew into stasis to protect them. Seven, now in command, has to make sure, that the ship will travel safely through the nebula for at least a full month. And although Seven never has been fond of social interactions with her crew mates, the days of loneliness suddenly make her feel uncomfortable and she realizes, she needs the crew more than she thought.
While I doubt that just one month of being alone on a spaceship with holodecks, that can create any diversion you could ever dream off (sports, a visit to your favorite city, nightlife, nature, climbing the Everest, fight historical battles, a romantic affair...) would be too hard to survive, it still is not a half bad depiction of being alone with the burden of responsibility for a ship full of over 140 people.
The showdown at the end, when Seven has to shut off life support to power the engines for the final few minutes to exit the nebula, is a little bit over the top though. This spaceship is huge. Even if you would shut down life support, there would be so much oxygen in the air, that a single person would be able to breathe for months. The temperature would also not drop to absolute zero right away. This ship is insulated, it would take time until it gets colder inside. So, Seven could have easily disabled life support and would have been perfectly fine.
Also, when they show the nebula on the computer display, it is quite wide but not very tall. Again, the writers do not think three dimensional. When it would take a year to fly around it, it would hardly take so long to fly over it! And by the way: What is a year of detour anyway? Unless they find a shortcut or are rescued miraculously, they will need around 60 more years until they will be finally at home. Most of the human crew members on board are around 30 to 45 years old. Even by Star Trek standards it is safe to say, that some of the crew will die of old age before they reach earth anyhow. And others will be 90 or 100. And what does it matter if you are 95 when you are back home or 96? At that age, you won't do much more than feeding pigeons in the park or tell your grandchildren about your adventures. Can we talk how dangerous it would be to fly at least for a month through an unknown nebula with only Seven and the doctor alive? They have encountered strange things in nebulas before. They never could rely on the idea that all will be fine. If something went wrong with propulsion, they could have been dead in the water in the middle of the nebula with no chance to be able to repair the damage because everyone would just burn to death in a few minutes after the crew had left their stasis chambers. And how comes Voyager carries like 140+ stasis chambers anyway? Are they stored in the same cargo bay where all the shuttles are stored? They destroyed like a dozen of them already and still don't run low.
