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The vertical support column of a hammerhead/T top/whatever you want to call it construction crane is made up of segments.

They appear to me to be about 20' or 6 meters. Is this pretty standard? Has anyone ever measured one?

~20' is pretty standard.

but i do believe they have sizes of 12', 15' too.

they vary widlly depending on manufacture and make
can 2/1.5/3/4/metres as a general rule though the first tower section will be longer and strengthend and then they should all be the same after that if measure one count then multiply however i would prefer to use a laser