A 3 day programming test?!
I guess if you were desperate for a job that may be acceptable, but no way would most businesses even attempt such a thing.
Even a mediocre recruiter or project lead should be able to tell if you can code well enough within a half hour, maybe an hour, of your time. Requiring a three day exam means they are inept at interviewing AND they don't respect your time.
I wish it's like what @Jan2Go just said, I heard they have a 10-days test that someone did in like 10 hours or so, but your opinion was unexpected reply .. really
Depending on how far you've come with the interview process, frob's opinion might not be that "unexpected". While I was applying for my current job I had another application sent out to another company. This other company told me during the phone interview, that the next step of there interview process would be a two-day onsite "test". I never found out how this would look like as I accepted the offer for my current job the day after that interview. However I don't think (i.e. I don't hope so, for both them and the applicant) that they would just place a candidate in front of a problem for two days, but instead want to see how that person is able to communicate with and integrate into the group. Which would basically be the same as what was done during the onsite interview for my job, but this one was only about five hours long.
Anyway, I interpreted your opening post in a way that this test will be the first part of the interview process. If that is the case, you probably won't be working on the test the whole time.