It looks like it was 18-20 from substrate to tip of spike. The new growth that took over after blooming is even taller than the last one. So if it blooms again, the spike might be too big for its own good 
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All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
-J.R.R. Tolkien, LOTR, Fellowship of the Ring
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