keep tasks for more than 60 days
I have been told that completed tasks in Office 365 are cleaned up after 60 days (removed) but would like the ability to retain these indefinitely.

With the release of Task ID in the task actions, the best approach here is to query the task IDs for the comments and other details and write them to an audit list. That way you can control the retention period in accordance with your retention policies.
This can either be done within each workflow that creates tasks, or if a blanket approach is adequate a site workflow that runs to a schedule, using the scheduled start capability.
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Amy Daniels commented
would love to be able to set a time limit based on wf. We have a retention policy for wf that process journal entries that needs to be kept for 7 years
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Amy Daniels commented
would like to be able to set a retention policy for wf, For example wf that process journal entries need to be kept for 7 years
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Aroh commented
Most of the organizations require Workflow History task list to stay more than 60 days due to their or organizations compliance. At least 1 year should be added.