Quick ? about Variable Names

["Phsst" <phsst@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Does anyone know if there is a limit on the number of characters that
make up a variable name?

The reason I ask is that I did a quick explore using variable names of
approx 27 characters and did not get the expected results.

Then I just reduced the number of characters in the variable name to 6
and started getting expected results.

Did not find anything doing a quick search against the help files.

TIA.