2005 Mazda 3 Power steering

I had bought a Mazda3 from an auction and had to replace my electric power steering. After doing so, my mechanic let me know that I would have to wait 2-3 days for the power steering to kick in. (Something about waiting for the Mazda's electric system to integrate with the electric power steering that was installed).
Having driven the Mazda for a little more than a day, I had seen no difference in the amount of force it took me to make one turn. I am now coming to you with the question. Will the electric power steering work after 2-3 days as my mechanic had said or should I be spending my hard earned pennies elsewhere. This is a huge issue for me because this is my first car and I don't have much money to be spending on wrong parts or anything like that.