When you generate a sample XML file from a schema, it takes a very long time to complete.
Some schemas are capable of producing massive XML documents that are only a few elements deep. The larger the resulting XML document, the more time is required to generate it.
Turn down the values for the following values within the sample generation wizard
"Force the creation of optional entities to a depth of"
"Stop Creating optional items after a depth of)
See the help for the XML Sample Builder Wizard
for more information about these values.