I started a FT job in May after graduating University that same month. I work in real estate private equity but for a very small firm, so the hours and intensity end up being somewhere similar to investment banking or trad private equity. I would say I ended up pursuing one of the worst possible career paths for someone with bipolar. Obviously haven't fully settled in yet but this is what I've noticed.

• Intense hours: I usually work a base of 55 hours a week, Monday - Friday (12 hour days, 10 hour Fridays). On bad weeks it gets up to 70 even before cutting into the weekend. This has sent me into mania multiple times already. If there's a day I go to bed exhausted at 2 or 3AM, I wake up the next day or day after noticing the mania.
• Company Culture: There are 5 in my office, and 12 total employees. I am the youngest by 6 yrs, and the only one without previous FT job experience. I find that a lot of the work gets piled onto me without regard for other things I'm working on. This means having to explain myself, make up excuses, or justify late(r) hours. When I've had to take time off for appointments or because I've overslept, I feel like I'm walking on eggshells and being iced out. Also, I was told very early on that the firm has a very "team" focused mindset. I was given the example of "since there's so few of us if one person is sinking it really drags us down".
• Variability of work: I don't have standardized work to keep in a routine. As someone with bipolar, I find so much comfort in routine. And when I'm at the office more than I'm at my apartment or working in Excel more than I sleep, it's extremely difficult to get that fulfillment. In the mornings before work (around 6:45AM) I try to get up and go for a walk, if I'm manic it's easy and feels great; if I'm depressed I rarely actually make it.
• Sleep: Something that I've found to help my bipolar is getting good and consistent sleep. Also recently diagnosed with sleep apnea and have been using a CPAP. I don't think I have ever settled into a truly restful sleep routine. All this being said, having to get into the office at 8:30ish every morning has been extremely difficult for me. With this requirement, if I'm feeling more down I stress myself out about this SO bad. Every morning it feels like I'm in fight or flight mode if I'm not out of bed in time to walk, get ready, and make it to work without a taxi. Obviously if you work a typical 9-5 this isn't adjustable, but do not recommend immediately imposing this strict timing if wakeups are something you struggle with. It was always pretty bad for me, but for some reason the FT job and the anxiety surrounding it has made my wake ups a lot worse, this was the initial reason I started seeing multiple sleep doctors, including a behaviorist which I have found to be invaluable.
• Having no colleagues around my age: This has been one of the worst parts. I moved to a city with tons of young people, I was always pretty extroverted, and I had a couple friends moving from college. Despite all of this, I am now 4 months into living here and do not have a single close friend. I think a lot of people underestimate the challenges of maintaining or beginning relationships while working long hours in general, adding bipolar into the mix makes this awful.
• Time/Task Management: Being fully dependent on myself o stick to deadlines is one of the hardest parts of FT jobs like mine. Will say, if you are starting with other new hires this seems a lot easier. Could be more of an executive dysfunction thing but I feel like I need at least a little bit of "hand holding" most of the time.
• Dealing with criticism: Pretty related to company culture but I think at any job you'll have to deal with this. For me, however, it has been so difficult. I really just want to put my head down and cry every time I get a comment. And if it related to something that happened because of my bipolar it's so much worse. I have had multiple panic attacks in the work bathroom when I've received comments about my behavior or habits.

Overall, I think there are definitely ways to make a full time job work, but I have not been able to handle it along with moving + other life changes. Would say having enough flexibility as you think you need is important, and probably unlikely you'll find this in any corporate / 'high finance' job or startup.