Does Vikunja have or plan to add Work Log and Time Estimation features like Jira?
These would include:
-
Estimated time per task
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Actual time logging with history
If not planned, would you accept contributions for this?
Thanks!
Welcome 
We have that planned as part of Vikunja Pro: Vikunja Pro
Would you accept a PR simply adding the ability to assign a time estimate to a task?
Not as part of time tracking, but as enabler for planning. I have some ideas for later additions to planning, and estimate of duration would make it much easier to plan.