From before I soak until they have produced a tap root is usually around 2 full days.

I then put them in the chosen medium. From there it is usually around 1 1/2 to 2 days for them to poke above ground.

From their they go just like any other.

I really don't know, now knowing that your pH is in check. Perhaps the beans themselves are on the "iffy" side.

Let me know if you do not have any better luck.

Keep the Peace