The longest known word in English, at 189,819
letters, is the chemical name of
titin.
Titin is the largest known protein. This word takes roughly 3 hours to pronounce.
I can't use the full chemical name of
titin because it goes over the word limit. So heres a shortened form:
I
just learned
today that Methionylthreonylthreonylglutaminylarginyl...isoleucine is the chemical name of the largest known protein to mankind.