pre-script timeout apparently cannot exceed 1800 seconds

Hi,

Our pre-script runs a large database backup and takes several hours to complete. In /etc/azure/VMSnapshotScriptPluginConfig.json, I have set timeoutInSeconds to 72000 to allow the pre-script sufficient time to complete - but it appears that the timeout always happens at 1800 seconds.

I've looked through the code of PluginHost.py and ScriptRunner.py, and if I've read it right, it appears that timeoutInSeconds can never exceed 1800, and any value set for it in the config files which is higher than this will be ignored.

If this is the case, was 1800 seconds chosen arbitrarily, or is it a hardwired maximum imposed by the azure vm snapshot software?

Thanks
Peter