OP here. Thank you so much for your replies. To the person posting troll, I know this seems bizarre and next to impossible, but unfortunately it's true. He's in there right now at 7 in the morning, and has been for 45 minutes so far. I've heard other women complaining about husbands being in the bathroom, so I never thought much about it. It's really gotten excessive lately, so I googled it last night and saw most women complaining about 20-30 minutes; that's what prompted me to post here.
It was shocking to see how, without exception, this is so far beyond the realm of normal. I suppose not shocking; it's something in my heart I knew was true. To the person stating that he probably prefers the company of books and games to that of myself, it's what I've thought in the back of my mind for a long time.

It is probably also speaking to privacy/personal space issues like many of you stated. Counseling is likely in order, although it hurts to read it in black and white. Not the thought of counseling, but the thought that our marriage has gotten so far off track.
Thank you to all of you for taking the time to reply.