Mine took 5 days working days, be sure to post your thoughts on a 3 sensor setup.
I have a friend that has 2 Rift sensors in opposing corners, as do lots of other Rift users, he thinks it’s great and can’t see the point in a 3rd, I tried it and found tracking poor in certain places of my play area, it’s now perfect with a 3rd, I would like to try a 4th sensor out of curiosity as i can’t see how it could be better