Duration job limit

Hi!

Is there any way to add a flag to set a limit for the job?

Example: --max-duration 300s and the job will stop at 5 minutes.

Maybe it can be added?

Thanks!

We are in the middle of adding this here: https://github.com/rclone/rclone/pull/3371

Nice! This will be very useful to have for backup scripts. subbed to issue.