I found out there is a limitation of 10 characters for field names if you output arcpy.ExcelToTable() to a "in_memory" table.
Why? Is it because dbf format is used?
I dont have this limitation when I use "in_memory" with other tools such arcpy.CopyFeatures_management().
Is there a way to use get rid of this limitation with arcpy.ExcelToTable() and "in_memory"?