"Four times every two years" isn't exactly the same as "twice every year", but also reflects a similar, "not that unusual" answer.

Although I didn't claim "twice every year like clockwork" in my top-level comment either. It's just a very basic statement of the base rate.

Make it eight-times every four years or sixteen-times every eight years. Or maybe "Four-times every other year, in a clustered fashion".

I don't think any of that really changes the point.