In addition to your scheduling hours, the events on your calendar, and the "breather time" you may have asked Amy and Andrew to keep in mind in your preferences, Amy and Andrew have a couple rules they use to run your calendar more smoothly: Lead time and commute time.
Lead time prevents surprises ending up on your calendar without enough time to prepare for them. If your contact tries to confirm a time less than two hours in advance, Amy or Andrew will politely decline and offer an alternative that gives you more time to be notified. They'll do the same for a morning meeting someone tries to confirm overnight, or even a Monday morning meeting confirmed over the weekend. However, if you specifically ask for a meeting to take place the same day the meeting request is sent in, Amy and Andrew will reduce the lead time to 1 hour to accommodate your instructions.
Commute time is how Amy and Andrew try and make sure you have enough time to get from point A to point B. In the future they'll be able to calculate this dynamically, but for now they apply a flat 20 minute minimum between a meeting scheduled outside your office and any other event on your calendar. So if your contact tries to confirm a time that leaves less than 20 minutes of commute time for these types of meetings, Amy or Andrew will politely decline and try to find an alternative.
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