seems impossible to have 100% of your time booked with meetings every single day.
are there not times when you are walking from your office to where the meeting is taking place? or from the meeting to a lunch room?
what about before everyone arrives at the meeting. meetings hardly every start on time, and even if they are back to back you will have 5-10 minutes somewhere. I can't imagine your first meeting finishing at 10:44am and your next meeting starting at 10:45am.
so there has to be periods where you can check your context lists.
It only takes 5-10 seconds maybe up to 60 seconds to look at an @Calls list, or @office list and see what is on there.
I mean seriously how long do you think it would take you to look at your @office list see that you have to grab that business card and you are done.