Open %JBOSS-HOME%\server\default\conf\jboss-service.xml


name="jboss:service=TransactionManager">
3600
${jboss.server.data.dir}/tx-object-store

[/sourcecode language='css']

3600
[/sourcecode language='css'] by default it would be 300, here we changed it to 3600 which is 1 hr.