[CentOS-mirror] Minimum Sync Interval?

Is there a a minimum sync interval for syncing from the msync nodes? I know it’s recommended mirrors sync 4-6 times a day, so every 4-6 hours.

I’m an advocate of getting updates to users as quickly as possible. I’m not opposed to syncing my mirrors on an hourly basis as long as it won’t cause a load problem for the server upstream of me. 

Thoughts?