Todoist is mainly about the future.
What needs doing?
What is due today?
What did I promise this client?
But completed tasks make it useful for looking backwards too.
A completed task is a tiny receipt
It tells you that a piece of work existed and that you finished it.
That is not enough to create a perfect timesheet.
It is enough to jog your memory.
A task called:
`Prepare August campaign report`
is much more helpful on Friday than a vague feeling that you “did some reporting”.
Task names matter after completion
This is a good reason to avoid useless task titles.
`Website`
does not help much later.
`Fix mobile nav on pricing page`
does.
You are not writing for a future archivist.
You are giving future-you enough context to recognise the work.
Client projects make the history cleaner
If client work lives in recognisable projects, completed tasks become easier to browse later.
You can answer:
What did I finish for this client?
without searching your entire account.
That is useful even if you never use Todoist for time tracking.
Duration is a separate question
A completed task tells you the work happened.
It does not necessarily tell you how long it took.
That distinction matters.
Task history is evidence of work, not automatic time measurement.
Use Todoist for what it already knows
You do not need to turn Todoist into accounting software.
Its job can stay simple:
Plan the work.
Complete the work.
Leave a useful trace.
A separate time tracker can deal with the hours later.
That is also the idea behind Tidst's Todoist workflow: use the work record you already create instead of starting from nothing.