If you find yourself needing to change the default reminder time on your Google Nexus One’s calendar, you can easily do so and prevent having to constantly change it when setting up important appointments on your phone.
1. Open the Calendar application.
2. Select the Menu key.
3. Select More.
4. Select Settings.
5. Select Default reminder time.
6. Select the desired reminder time. Choices are None, 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, 45 minutes, 1 hour, 2 hours, 3 hours, 12 hours, 24 hours, 2 days, and 1 week.