I am trying to duplicate tasks in the project module in Odoo12. I have used the "copy" function that is present in the base module.

This is the below code:

    @api.multi
    def template_override(self, default=None):
        if default is None:
            default = {}
        if not default.get('name'):
            default['name'] =("%s (copy)") % (self.name)       
        project = super(ProjectExtension, self).copy(default)

This works perfectly when there are less amount of tasks that has to be copied. But when many tasks like 190 tasks has to be copied, it takes a long time and fails. It does not complete the process. No errors are shown on the console