Oncididium Splendidum with unusually tall but unblooming spike

[camille1585]

Dang, that thing's also taller than I am! You're going to need to cut a hole in the ceiling. I know that spikes on this species frequently push 4 feet in height, but yours is well past that. I don't think anyone can tell you when it will set buds.
What sort of light is is getting? Low light usually leads to taller, leggier spikes, so if that's the case maybe putting it in a bright spot will encourage it to stop growing and bloom.
You are seriously going to set a record with that thing!