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When checked in, the icon disappears and is replaced by a checkout icon in the top right corner.
Notice that if you register time when checking out, the registration will be based on the check in+check out times, rather than a number of minutes. This may affect rounding of registrations.
No checkin
You can get a warning if noone checks in on a task, see more here.
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I'm loosing single minutes on hour registrations when checking out