Any FOSS todo lists with time-blocking calendar feature?

I like todo lists, and I like time blocking so I can schedule out specific hours to work on each task. However I have yet to find an app that combines these cleanly.

Features I am looking for:

Todo list that allows nested lists, and adding details to each item (due date, more detailed instructions, etc.)
Seamless integration with a calendar, so I can assign a given todo item to a date and time
Adjustable time durations. Not every task is exactly 1 hour.
Accessible and syncable across PC and Android,
Freeee....?

Nice to have:

Sync with Google Calendar/Tasks
Color-coding tasks

5 comments

https://tasks.org/

When combined with Davx5 it will sync to a server. Integrates with calendars as you desire, I think (my workflow doesn't include the time blocking but the tasks show up on a calendar and you can specify their duration but I'm not certain about the time blocking).

3
I'm using Tasks.org with DAVx5 (android) and an external Nextcloud hosting.

You can set blocks of time, nested tasks and it adds them to the Nextcloud calendar. I think Tasks.org can sync with Google Tasks, but it has limitations.

My only step left is self-hosting Nextcloud.

2
- How can you control duration of calendar entries?
  
  1
  
  When creating a task, you can choose a Start, End Date and a Timer.
  
  You also have to select the Calendar where you want Tasks.org to save your task.
  
  In Nextcloud is the same while creating tasks, but it'll create a Calendar for every list of tasks (e.g Personal tasks, College tasks, etc)
  
  2