Forms :: Hold Record With Time And Go Back To It Later?

I am preparing a database to track the daily activities of my team. This is a real time database wherein the users will add their daily ongoing task and submit.

The action for me is, I need to capture the time required for each task.

Also, there is a possibility that the user will have to hold a task for a while/days due to some issue and will start another task. Once they have a feedback on the issue they will resume the pending/holded task.

Here, I need to capture only the time they have invested in performing the task and ignore the time spent to receive feedback on the issue. Hence the time should start when they start the activity and pause when they hold the activity. Again, the time should continue where they had paused, when they re-start the holded activvity and finally ends when the submit.