most online reports indicate 6 months if cut in 2-foot lengths and split; longer time to weather if cut longer/not split/etc.
Ash has a lower water content than many other hardwoods, which has lead to a misconception that it can be burned green, or earlier than other hardwoods. From what I can tell, the lower water content is accurate, but it still needs to season @ 6 months.
You're using an axe to split it? Hmm. You should invite
@demlion to drive over and help out. He has lots of apparatus for splitting. Of course, he may bring his boat along, so there's no telling what adventure he'll get into before departing.