Some how I got one to drop yesterday. Had a few looks but the greens at the course I was playing were hard to read and some just didn't roll true. But it still keeps me on the train.
Last few seasons I used to make 1 bird on the front and 1 on the back but this year I'm struggling to get 1 per round, just not making the putts. Can't remember the last time I made a putt for bird of any decent length.
While I appreciate and understand the question, in its present form I cannot answer appropriately. Unfortunately, for me the question must be phrased as--how many rounds does it take for you to make a birdie. That answer would be usually two. I typically birdie a hole every other round.