1) Depends on whats being done in the notification templates, like the one you have some issues with there (open the file mentioned to see witch template this is).
2) again, depends on whats being done in templates. But if this is first time you run it, there might be a lot of pending notifications waiting to be sent out.
Thanks for your reply.
Isn't there (or shouldn't there be) a way to buffer or limit the range of the cronjob per run? If not, what if someone had 500000 objects with notifications never on, and then decides otherwise? ;)