Wicner, it is possible but not recommended. Out of box, it is 240 chars:
value STRING(240)
you would need to change the schema to fit into more than 240 chars. But then, next release/patch update will make it
240 again. Therefore, it is not recommended. Instead, you should consider another property right after that one as optional in case end user would need more than 240...that will give it 480 chars total and hope this fits most of the cases. If need more, use attachment to attach a file to the ticket. Thanks _Chi