actually..wow yeah nah you dont get the invitation in the next round, you get it either at third or second round after you apply, according to statistics of every single application for the last months, based on immitracker and this forum.
So the waiting time for Software Engineers with 75 points is:
14 - 28 days
I am also a Software Engineer(261313) with 75 points and I am waiting from 15th Feb. I have not received the invitation yet.