You have a choice to hold meetings at your place or someone else’s one. If you have to visit someone at an external location you will easily spend one hour or even more for getting there. Even within the same office building going to a meeting room or your colleagues office will take you a few minutes and significantly increase the risk of interruptions and distractions by other colleagues you will meet on your way.
I know that there are limitations to schedule all in your place (customers, superiors, politeness, want to see the place of a new client, etc.), but keep this in mind when you schedule meeting. If you can shift only 5% of your meeting you will gain many extra hours per year.