Thank you all. All you suggested was right and correct! And what do you think about Julie Morgenstern's approach. She suggested to write down all next actions (that is part of GTD), then put down time required to complete it, deadline and ROI. Then based on that choose what to do. It sounds like a reasonable approach.
You can take into account how much time you have till next meeting, coming deadlines and if all were equal then the ROI. Though I tend to choose based on RoI only