Although the IM Tables in a Interface Context View display the Business Hour Definitions assigned to an interface using a Site Group, the results within the table don't actually apply any filtering at all. The utilization numbers are being calculated on the 24x7 data and not the business hours. This is very misleading to our end users.
If you use an IM Trend Chart instead of an IM Table the chart will still display all of the data but with a white background for business hours and a gray background for non-business hours. That's a nice visual but it really doesn't help our network engineers make any business decisions about required network bandwidth. For that they really need the summary statistic type utilization numbers to be calculated using our defined business hours (like CA eHealth does).
I opened a support case for this thinking that I had discovered a bug, but I was told it's functioning as designed and to actually use the defined business hours in the Context Views would be a product enhancement. So that's why I'm posting it as an idea here, mark your vote if you care about business hours.