Sapphira wrote:
1. Do you have a rough idea of how many miles long that trip will be (it doesn't have to be perfect, just believable)?
I always struggle with this! Usually you don't really need to say the specific distance. You could just say that it was a very long journey or something like that.
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2. Should I tell about the whole trip, or just a few parts (like the first few days, which I have in my first draft, then just say the rest of the trip was uneventful)?
Well, if the rest of the trip was uneventful, then you can say that!

I wouldn't put too many things in just for the purpose of length, though. That can get rather boring sometimes.
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3. Any other feedback? (I'm also wondering if this book could end up too long, or how long is "too long")
In my opinion, there's no such thing as a book that's too long!
That's my 2 cents! I hope it helps!