Delusions of Grand Finale

I've been rewriting my novel for about a year, and this weekend, I discovered I didn't know what to fix next. So, I embarked on a complete read-through to find out what sucked, and lo! Only four chapters out of twenty-four still suck. Go, me!

In fact, I'm really delighted with most of it. Yes, I'm too close to the work to be objective, but it's still a nice feeling when you're on the swell of the [I'm a talentless hack/I'm better than buttered toast, I am] wave.

One of the weirder things about writing this novel is that I've spent most of the process thinking I'm almost done. Literally, I've spent two years thinking I'd be finished in a month, maybe two.

Holy molybdenum, I'm glad I didn't have any real clue. I would have given up in despair.

But now? I really am almost done. For sure. Liek woah. A month, maybe two. Just don't lay any bets on it.

How common is this delusion phenomenon among writers? Do the rest of you also spend large quantities of time thinking the end is in sight, or do you have a realistic time frame in mind and the doggedness to keep going even when you know there's a long way to go?