We've been saying that every day this week so far.
This task is so frustrating! We just keep going in circles, I feel like I'm in a pinball machine or perhaps a house of mirrors. Just banging into obstacles, churning around in circles, again and again. Each time we formulate a plan and put it into motion, something else goes wrong, or we discover a new business rule we didn't know, or any number of oddities.
Yesterday we learned something that made almost three days of work useless. This morning, it was beginning to look like five days of useless work... but now we've found that some of it is useful after all. It's just frustrating, and I feel like I've been working madly but gotten very little done.
I think we've got all the pieces put together, and we'll be able to finish this tomorrow. I'd predict a half day, but that's already proved to be a dangerous prediction! Although as K said, "Monday I'm working on something else. Whether this is done or not."