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I just rebuilt about 60% of our invoicing system this past week. So yes, depending on your needs, it can be done.

So... 2.5 weekends, and you're only 60% done.

And as they say, you get 90% of the work done in 90% of the time and the remaining 10% in 90% of the time.

80% done, only 80% to go!

20% of the time, it works every time.

It was already done, we just reworked a large portion of it. Done with that already, 3 days of work.