Hi Hemi,
Thanks for reaching out!
I'm afraid the default duration is something that Google is adding, not Trello. Trello events don't have a duration at all, because it's not really a calendar, it's a view of dates and times that things are due, and was never meant to show lengths of time in the way a normal calendar does. When you show that in a real calendar, it needs to pick a duration in order to have something to show properly, and 30 minutes is Google's default choice.
I believe there's a way to change Google Calendar's default, but that wouldn't really solve the problem of making it a customizable per event, unfortunately!
With that said, this could be possible if we also synced start dates with third-party calendars but that's also not possible right now. We're tracking this as a feature request with the team, and I've added you as an official +1 to that.
You could look into third-party Power-Ups to see if they offer the functionality you're looking for here: https://trello.com/power-ups/search?q=calendar.
Please let us know if you have any other questions, and we'll be happy to help.
All the best,
Lara
The Trello Team
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