One of my friend applied in March and he got it in 10 days. Another one applied in the start of April and it took just little more than a month.
You must be lucky if you applied before 27th of April, because you'll get the letters before July 1st, if all the proper documents are submitted.
I'm going to apply in the coming days and wondering what if I get it after July 1st. I will have to apply under EOI scheme. I don't know how it is going to affect.
Good luck with your application!