I played for about 2 weeks last year, and then rediscovered it over my exams and kept it going up until a couple weeks ago when I got Bicentennial ~ which I considered the end of the game really.
I played the new beta for abiut 3 days too, but it's broken as hell and I had 500 cursors and grandmas and 275 prisms after those 3 days. Will probably see what gets added when the update is done but I think I'm actually just done with it forever now.
I remember discovering that game August of last year, and I showed it to my friend and we played it for days. He got way further than me though and when school started up, I had a study hall in a computer lab, and I was bored so I wanted to see if Cookie Clicker was blocked, and it wasn't, So I played it, and then my other friend started playing it, and then eventually, more of my friends started to play it, and one of my friends got caught, so the website was blocked. It's been like a year so I wonder if it still is. :O
Cookie Clicker! ~ I starting playing around this time last year. Got a few friends into it. Then after a few weeks the whole school is obsessed. At every passing period all you hear is the sound of golden cookies falling from the heavens. 6 months later Flappy Bird exploded through my school. I pray for anyone who still plays Flappy Bird...