What's the right way to write down my appointments/events slots?

The Smart Planner currently supports the following time format: 12 hour AM/PM notation. The 24-hour clock is not currently recognized.
The Smart Planner supports the following formats for indicating time span:

All of these examples will create a 2-hour event from 1PM to 3PM

If you only specify an event start time in the Smart Planner, a 1-hour event is automatically created in your digital calendar.