At what point will the Confidence Metric for a analyzed system always be High?

At what point will the Confidence Metric for a analyzed system always be High?

A.
After 1 week

B.
After 24 hours

C.
After 12 hours

D.
After 1 month

Explanation:
vSphere Basic System Administration vCenter Server 4.0 ESX 4.0 ESXi 4.0, page 95.
After 24 hours of analysis, vCenter Server indicates a high level of confidence in its
recommendations