[Lizard]

We don't really have a way to express the idea of a task being partially complete, then interrupted for a while to do other tasks. Perhaps we should. In the meantime, one clumsy workaround would be to make two tasks out of the partly done tasks. One that represents the done part and is 100% complete and the other representing the unfinished portion and 0% complete. Then you can accurately record when the first portion was done, yet leave the remaining work to be scheduled when it fits.