After adding a new VDA to a delivery group, how long typically till Upgrade Service is available for that VDA?

I've found within 10-15mins roughly

Yeah, I added a new one to a machine catalog now, VUS wasn't available for a couple hours, but then when I disabled and re-enabled VUS on the machine catalog, it was available within a few minutes.

sometimes in the background it needs to update the VUS agent to a better version, then it starts showing the right status in the Catalog