How small to split oak

[Gav73]

The last lot of oak I had was split into pieces no more than 3 inches at the thick end. Max length was around 16 inches. I didn’t burn them for 2 1/2 years. They were under cover with no rain getting on them, but in a nice windy and sunny spot.  I also didn’t stack them as tight as I normally would to allow as much air to blow through as possible. I reckon I could have used them after 2 years of seasoning.