To Help out with the guys that had sim checks earlier in the year, I had my interview around the 20th January and sim around the 20th February. Offer came a couple of weeks later and started in July. This was one of the last courses for a while, so hopefully you can see potentially how close you are to an offer.
Obviously dependant on how many people were going through stage two each week, how many of those were successful and most importantly, what fleet you're on.
And yes... it's worth the wait.