I recommend trying out OnlyOffice. It's free and it's scarily similar to MS Office, to the point where there's no learning curve and it's impressive how they haven't gotten sued yet. Plus, it's got a Windows version so you can try it out without committing to Linux
I'm not a fan of LibreOffice, even with the GUI tweaks to make it look like MS Office, so I've been actively finding Office alternatives for a long time now. OnlyOffice is by far the best one I've found
Hmm... Interesting question. Not a lot of time, on average. Even at home, there's always some sort of management or planning to do. Always need to think about what comes next. But the busyness comes in waves. Occasionally I get a week with really nothing to do. And then, inversely, there are weeks where everything is happening all at once and it starts to feel like I can't keep up and things are starting to slip. I'm currently in one of those weeks, but I'm sure it'll pass. Just need to get through it. That's the life of a researcher for you. There's definitely a level of masochism required for this sort of lifestyle