work hour highlights

In my use case i work til 3:30 pm and would like to be able to see my calendar and at a glance know since when im available. I could, for instance, create events for the day but this would clutter other events in same schedule so i think a line (or more in such use cases) could be really useful.

furthermore, i don't think it should be only for "today" such as the current time. Thanks!