1. Guest disk monitoring feature is only available for VMware VMs, currently we do not collect this information for Hyper-V VMs.
2. Performance and events data is collected in real-time, there is no schedule for that. As to the collection jobs, then they retrieve only configuration data from your Hyper-V environment and I bet this data doesn't change very often, right?
I would recommend running your collection jobs every 4 hours, at least I have specified this schedule for my own lab. This schedule shouldn't have any negative impact on your Hyper-V host performance and it should allow you to report on the most recent configuration changes of your VI.