Option to set "no duration" as default for tasks

When creating tasks, I would prefer them not having a default duration.

The tasks I create are often not yet fully scoped, so they might be stuff like "move things into the basement" or "plan weekend "trip".

None of these would be great with a default of 15m, 1h or more. I personally would prefer having the option to not set anything as default, so that I have to set the duration myself in the inbox.