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How to use 3T with Trello

How to track time in Trello

Time import from Trello

Track time by comments

Track time by checklist

Track time by moving cards

Track time by power-up

Power-Up for Trello

Background task for Trello

Kanban Desk for Trello

How to integrate Slack

How to manage Slack files

Dashboard

How to add estimates

How to edit time

Timeline

How to plan with Gantt and Gantt for Trello

How to get reports for Trello

How to set-up and generate invoices

Hourly rates and profitability charts

API

Disconnect Trello

Time tracking by Trello Power-Up

Install 3T Power-Up for Trello.
Use buttons on every card to start and stop time tracking.
3T power-up
3T Power-Up shows total/currently time spent and estimates as well.