[cutthegrass2]

I think 2ys is the "been here long enough to show commitment and deliver something sizeable, but now ready for something new" period of time. 3yrs seems a little too long to stick at something to signal the above.

[benogorek]

I think you're right and that two Christmases and two Easters and almost 700 days is enough time, but there is the perspective out there that the 2-year mark is when you've finally learned enough to be productive and the 3rd year is when you're actually running on all cylinders.