Yes, it would be. If you have good time management you would toss the project and keep looking for a position.

If a company I'm trying to find employment at wants me to take my interview home for the entire weekend, it sends all sorts of bad signs:

1. They don't see working on the weekend as unreasonable.

2. They don't value my time.

3. They aren't comfortable making hiring decisions and taking on risk. What other hard decisions aren't going to be made or are going to be made too late by this company?